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Manure Collection, Storage and Treatment

Value Chain
Climatic Zone
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Manure is organic matter that is used as an organic fertiliser in agricultural practices, conditioning and adding nutrients to soil, generally derived from animal faeces. Manure is the best source of fertiliser available to a farmer, as it can be readily available from livestock, and it a more environmentally friendly option over synthetic fertilisers. Animal manure, compost and green manure are the three different types of manure used in soil management. Manure is collected in different forms: liquid manure, slurry manure or solid manure, and treated in different systems depending on its state. Liquid and slurry manure are stored in liquid (slurry) manure storage systems whereas solid manure is stored in sacks in order to allow air and toxic vapours to move in and out, as well as to maintain the moisture content. The manure is collected and treated (as described below) in order to kill pests that may feed on crops during the application period. The manure is further cleaned to remove unwanted substances such as sticks, and large lumps formed in the manure.

Technical Application

To effectively implement manure collection, storage and treatment:

  • Step 1: Use gloves before handling animal manure from any livestock.
  • Step 2: Use shovels and wheel barrows to load and transport the material.
  • Step 3: Store manure in a contained area, with a solid bottom (cement pad) to prevent runoff and leaching into local waterbodies or groundwater.
  • Step 4:  Mix all types of manure with organic substances such as vegetable waste, garden debris, dead leaves, sawdust, wood ash, hay and straw etc. to add structure and other organic compounds to the soil.
  • Step 5: Turn mixed manure over regularly to allow for combining of nutrients and further aeration.
  • Step 6: Cut-up large particles of animal manure to no more than 10 cm in size.
  • Step 7: Spread manure evenly on field a few weeks prior to planting or during planting. It can also be applied in micro-doses around crops and trees directly.
Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Organic matter in manure can be used to fertilise crops, improving soil health and productivity.
Increase Resilience
Manure collection and management can contribute to crop production.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_48_ManureCollectionStorageAndTreatment_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • The use of manure helps to maintain the organic-matter content of the soil, which can improve soil structure, increases nutrient availability and crop productivity.
  • An additional benefit is that it increases soil carbon and reduces atmospheric carbon levels.
  • Manure application can be spread across fields or in micro-doses.

Drawbacks

  • Manure leachate can carry concentrated ammonia and other potentially harmful organic compounds. Therefore, it should be contained in one area to prevent possible negative environmental impacts from runoff.

Fodder

Value Chain
Soils
Climatic Zone
Water Source
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Fodder is the agricultural term for animal feed. Fodder trees and shrubs play an important role in bridging the gap between livestock feed requirements and the low quality and quantity of feeds available to many farmers. As well as providing feed or acting as a feed supplement for livestock, fodder trees and shrubs supply other benefits, such as firewood and erosion control. Fodder trees are either grown in-situ, from seed, and others are planted in nurseries and then transplanted to the field at the beginning of the rainy season. The transplanting method can be more successful than the direct planting - as high as 34 % better, but with a 24 % increase in cost per plant. Benefits of using fodder trees and shrubs as a dietary supplement include improved growth, health and reproductive capacity, and increased milk and meat production, mostly through increased protean uptake. Fodder trees and shrubs can be planted as living fences, field boundaries and in tree/shrub plantations. Popular species include African acacias, and Atriplex nummularia, Cassia petersiana, C. mopane, D. cineria, F. albida, Julbernadia paniculata, P. reclinata, Piliostigma thonningii, Swartizia madagascariensis and Trema orientalis.

Farmers of all categories can use this climate smart sustainable approach to produce both livestock and field crops to obtain improve benefits, improving nutrition for livestock animals, improving soil health, reducing cost of livestock feeding, and as a result increasing income

Technical Application

To effectively carry out fodder tree-shrub production using a nursery environment – a covered or exposed separate planting area, often close to the farm so saplings can be tended easily - consider the following steps:

  • Step 1: Identify one or more suitable species for fodder production, looking at suitable climatic, soil requirements, nutritional value and palatability, also considering source-plant (for cuttings) or seed availability.
  • Step 2: Take cuttings of up to *1 metre in length from mature trees, cutting at an angle. Cutting should be planted within three days, and if transported, cutting end should be covered in wax or petroleum jelly.
  • Step 3: Cuttings should be planted in 10 to 15 cm of soil either directly where they will grow or shallower in polythene planting cups.
  • Step 4: Fodder crops should be planted as the rainy starts, providing sufficient water and mobilising enough nutrients to assist rapid growth.
  • Step 5: Harvesting is again species specific*, and it is important to determine if drying prior to feeding, affects palatability or nutritional value.
  • Step 6: Harvesting frequency should also be determined independently*as plants mature to ensure sustainable production that does not stunt long-term growth and productivity.
  • Step 7: The farmer should consider how much fodder needs to be consumed immediately, how much dried as hay, and how much chopped and compressed to make silage.

Length of cutting, period prior to transplantation, and harvest quantities vary from species to species. Seek guidance from an agroforestry specialist or farmers that have experience with the process when selecting species, and how specifically to plant, manage and harvest fodder crops. An important element to understand is the volume of tree or shrub-based fodder each animal will require.

Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Higher meat and/or diary production per unit area of land.
Increase Resilience
Diversification of diet can mitigate the effects of drought on availability of fodder in pasture/ rangeland. Co-benefits in improving soil fertility and reducing erosion.
Mitigate Greenhouse Gas Emissions
Woody shrubs and trees lock carbon.
Additional Information
  • Franzel, S., Carsan, S. Lukuyu, B, Sinja, J. Wambugu, C. 2014. Fodder trees for improving livestock productivity and smallholder livelihoods in Africa. Current Opinion in Environmental Sustainability. 6
  • World Agroforestry Centre, 2019. Fodder.
  • Smith, O.B. 1994. Feeding fodder from trees and shrubs: Better Farming Series No. 42. Food and Agriculture organisation of the United Nations. Rome, Italy.
  • Karanja G.M. and C.M. Wambugu 2004. Fodder Trees for More Milk and Cash. Ministry of Agriculture (Kenya)/Kenyan Agricultural Research Institute, Nairobi, Kenya.
  • Chakeredza, S., Hove, L., Akinnifesi, K.K., Franzel, S., Ajayim, O.C., and Sileshi, G., 2007.Managing fodder trees as a solution to human–livestock food conflicts and their contribution to income generation for smallholder farmers in southern Africa. Natural Resources Forum 31 286–296
  • Steven Franzel, S., Carsan, S., Lukuyu, B., Sinja, J. and Wambugu, C.2012. Fodder trees for improving livestock productivity and smallholder livelihoods in Africa. Current Opinion in Environmental Sustainability, 6.
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_44_FodderShrubsTrees_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Fodder trees and shrubs can be highly beneficial sources of feed and nutrition for livestock, augmenting, or completely replacing traditional grazing.
  • Can be utilised when over-grazing has occurred, to allow range land to regenerate.
  • Fodder trees and shrubs add vital nutrients to the soil.
  • Fodder trees and shrubs can provide other benefits, including acting as living fences, and wind-breaks, as well as supplying firewood.
  • Crop rotation is important and fodder crops often act as nitrogen fixers (legumes) as well.
  • Fodder crops can also act as cover crops protecting and maintaining soil quality.

Drawbacks

  • Growing fodder can be laborious.
  • The number of fodder trees and shrubs may be extensive, therefore sufficient land is required.
  • Not only does the gathering of fodder require additional labour, but the harvested crop also requires management.

Farmer Managed Natural Regeneration

Value Chain
Climatic Zone
Water Source
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Farmer Managed Natural Regeneration (FMNR) is a technique of restoring degraded land and monitoring restoration of the land involving the systematic regeneration and management of trees and shrubs from tree stumps, roots and seed. Degraded arid land often features left over indigenous plants, which if maintained and promoted to grow can improve pasture and crop lands while simultaneously encouraging re-growth of seeds, roots and shrubs. Key to this practice is the existence of living stumps, tree roots and seed that, if encouraged, will regrow. The land is protected from being completely cleared or further grazed and this allows trees to grow without disturbance. Once the stumps and trees start to grow, pruning and trimming of trees is required to allow space between trees and promote healthy long tree trunks. Once the trees have matured, intercropping can take place or livestock can be re-introduced to graze.

While requiring some investment in terms of effort, FMNR has climate smart advantages such as controlling rainfall/irrigation run-off, supporting water quality improvements, providing sources of timber or fodder, supporting habitant regeneration for pollinator insect species, acting as sun shade, and reducing soil erosion.

Technical Application

To effectively implement Farmer Managed Natural Regeneration:

  • Step 1: Degraded land needs to be identified and living stumps, roots and seeds need to be encouraged to regrow. This may include periodic watering. Focus should be on indigenous species, and present tree species (existing stumps).
  • Step 2: Consider leaving the field un-grazed to promote tree growth.
  • Step 3: Select tree stumps and the tallest and straightest stems to grow into trees.
  • Step 4: Prune and manage by removing stems and unwanted side branches.
  • Step 5: Maintain the process by occasionally pruning side branches.
  • Step 6: Manage the land consistently to avoid overgrazing, which can lead to further degradation.
  • Step 7: Consider rotational grazing to allow seeds, stumps and underground shrubs to re-grow. This will reduce the cost of replanting. Shrubs and growing trees and saplings need to be protected before introducing livestock. Shrubs and growing trees and saplings need to be protected before introducing livestock.
Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Increase availability of biomass, which improves soil fertility and thus production. The trees/shrubs can be a source of income and reduce costs.
Increase Resilience
Reduces erosion of soil and evaporation. Increases water retention and infiltration. Diversifies income sources. Improves yield stability.
Mitigate Greenhouse Gas Emissions
Locks more carbon in plants and in soil.
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_35_FarmerManagedNaturalRegeneration_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • FMNR improves soil quality and reduces soil erosion.
  • Improved dry-season pasture.
  • Agricultural management practices such as pruning, and trimming are carried out appropriately in turn improving growth and air circulation.
  • Higher livestock productivity.
  • Provides protection from wind and shade for livestock, when introduced.
  • Increased availability of firewood, thatch and other non-timber forest-products/materials.

Drawbacks

  • The land needs to be managed consistently to avoid overgrazing.

Agroforestry: Silvo-Pasture

Climatic Zone
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Agroforestry is a land management practice that combines the planting and management of trees and shrubs with crops and pasture, providing benefits of soil health, crop yields, resilience to climate change, biodiversity and economic opportunities. Agroforestry encompasses numerous practices, including silvo-pasture, agro-silvo cultural, and agro-silvo-pastural. One such successful agroforestry practice is silvo-pasture – the planting of trees and shrubs within livestock grazing pasture lands. Not to be confused with agrosilvopasture (combination of crops, shrubs/trees and livestock, silvopasture is the combination of trees and shrubs with pastural grazing land. The trees can be regularly or irregularly placed, and in addition to improving soil conditions in pasture lands, also provide production of protein-rich tree fodder for on farm feeding and for cut-and-carry fodder production. If growing larger species of tree, coppicing can also produce timber for building materials and firewood.

Technical Application

To effectively implement hedge planting:

  • Step 1: Purchase saplings of selected tree species from a local nursery or grow saplings in separate on-farm nursery. If growing on-farm, saplings should be held-up with an upright support bamboo/wooden pole. Ideally, the farmer should begin exploring silvopasture tree species beginning with indigenous trees, such as acacias, and other local trees. It is worth considering a mixture of species, as well as mixed shallower and deeper rooted trees.
  • Step 2: Once at a meter or over in height, transplant to pastures, surrounding each individual sapling with a wire mesh cage-tube or insert into five-centimetre diameter PVC pipe to protect from browsers. Plant at least ten to twenty meters apart, in either a random or uniform pattern. This is a matter of preference.
  • Step 3: Once saplings are planted, only allow grazing livestock (cows, sheep, ducks, geese, chickens) in the silvopasture, avoiding browsers (goats, etc), which will strip, damage or destroy the saplings.
  • Step 4: Once mature and above browsing height, two plus meters, remove protective cage or pipe.
  • Step 5: Depending on species, pruning, coppicing etc should be performed every two months to ensure that trees remain healthy and productive, while maximising outputs for in-field and cut and carry fodder.
Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Diversified agricultural outputs supports sustainable agricultural productivity, providing multiple streams of revenue, reducing labour and cost for land clearance and maintaining healthy pasture land.
Increase Resilience
As climate change alters local grazing land, silvopasture can reduce overgrazing and land degradation. Trees introduced into pasture can create a more positive environment for livestock, including shade in warmer climates, and shelter during rainfall.
Mitigate Greenhouse Gas Emissions
Retaining trees within pasture land and minimising complete conversion of land reduces greenhouse gas emissions and retains carbon in the soil.
Additional Information
  • Balehegn, M., 2017. Silvopasture Using Indigenous Fodder Trees and Shrubs: The Underexploited Synergy Between Climate Change Adaptation and Mitigation in the Livestock Sector. Chapter from book The Need for Transformation: Local Perception of Climate Change, Vulnerability and Adaptation Versus ‘Humanitarian’ Response in Afar Region, Ethiopia (pp.493-510). ResearchGate.
  • Jose, S. & Dollinger, 2019. Silvopasture: a sustainable livestock production system. Chapter in J. Agroforest Syst (2019)
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_34_SilvoPasture_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Presence of trees can be beneficial to livestock in terms of shade and shelter, as well as enhancing carbon storage and enriching biodiversity.
  • Manure from livestock can improve soil health in grazing land.
  • Leaf litter and pruned material also add organic matter to soil, improving productivity and drainage.
  • Presence of trees can contribute to reducing soil erosion.
  • Trees can produce numerous forest products, including timber for firewood and construction.
  • There is an opportunity to diversify income for small-holder farms and increase food security.
  • Tree trimmings and leaf litter can also be used for in-field or cut and carry fodder.

Drawbacks

  • Requires some investment in terms of purchase of seed and/or saplings.
  • May require adjustment for mixed grazing and browsing livestock patterns.
  • If dietary requirements of livestock are not complete, animals may strip bark from trees. This can be avoided by ensuring that pasture stocking is not too high, and best efforts are made to encourage pasture health and supplementing livestock feed with the necessary minerals, energy and protein.

Boundary Planting

Climatic Zone
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Boundary planting, also known as live fence planting, is a technique used to protect crops from the interference of people and animals that can disturb plant growth. Trees/shrubs are a good example of this approach as they can form a shield when planted along the boundaries of the garden or surrounding a planted field. The trees/shrubs act as wind break to shield plants against strong winds causing physical damage to plants themselves, or the removal of soil (erosion). Additional benefits include the use of branches for firewood or building materials, and the other parts of trees can be used as fodder, fruit or leave harvested for consumption, or for medicinal use. Tree/shrub spacing is critical, as trees that have dense canopies can conversely cause destructive down-drafts, negating the intended benefits. Boundary planting helps limit global warming by mitigating GHG emissions through reducing harmful gases such as, carbon dioxide, from the atmosphere and releasing oxygen.

Technical Application

To effectively implement Boundary Planting practices:

  • Step 1: Plant long lines of two fast growing trees, Caesalpinia velutina trees, between a Bombacopsis quinate and a Swietenia humilis to be replaced over time.
  • Step 2: Consider planting the boundary trees 1.5 metres apart along pre-existing fences.
  • Step 3: Attach metal fencing to the trees to support the large trees without endangering their growth. Harvest fodder when the tree is overgrown.
  • Step 4: Prune lower brunches to encourage upward growth of trees and reduce shed on the plants.
Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Increases availability of tree shrub products (nuts, fruits, timber etc.) and biomass, which improves soil fertility, and thus production.
Increase Resilience
Reduces erosion of soil and evaporation. Increases water retention and infiltration. Diversifies income sources. Improves yield stability.
Mitigate Greenhouse Gas Emissions
Locks more carbon in plants and in the soil.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_33_BoundaryPlanting_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Live fence planting is cost effective, conserves soil moisture, acts a windbreak and reduces soil erosion. These trees have various benefits such as medicinal use, mulch, livestock feeds, fruits, bee forage, timber and firewood.
  • Maintenance of boundary trees is low with short, medium and long ecological and economic benefits.

Drawbacks

  • Boundary planting occupies more land than a single row.

Agroforestry: Alley Cropping

Annual Average Rainfall
Climatic Zone
Water Source
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Agroforestry is a land management practice that combines the planting and management of trees and shrubs with crops and pasture, providing benefits of soil health, crop yields, resilience to climate change, biodiversity and economic opportunities. Agroforestry encompasses numerous practices, including silvo-pasture, agro-silvo cultural, and agro-silvo-pastural. One successful agro-silvo-cultural practice is alley cropping, where the farmer plants rows of trees, shrubs or hedges between crop rows. Usually hedges comprise leguminous plants intended to fix nitrogen in the soil and provide leaf litter and prunable biomass. The hedges are pruned with the pruned material spread on the ground, to reduce shading and competition with the primary crop. Timing of pruning is important to ensure that the pruned biomass releases nutrients to the soil at a time when the primary crop needs them for maximum crop productivity; e.g. when alley-cropping maize, the pruned biomass needs to breakdown with and release beneficial nutrients into soil from two and eight weeks after planting the maize crop. This approach has proven to be highly successful, with examples in Malawi where gliricidia was alley-cropped with maize where the prunings created a three-fold increase in maize production, which was increased a further 29 % when fertilisers were added. This fertilisation could be achieved with green manure, and other climate smart soil amendment approaches. The space and number of hedge rows to primary crop is dependent upon the field size and the regular growth height of the shrub/hedge. The hedge must not be planted so close that it shades the primary crop. In larger fields, larger deep-rooted timber trees can be planted between groups of rows of primary crop, providing soil benefits, reducing wind-speeds/erosion, and providing timber products.

This approach is considered climate smart as it increases productivity, provides a mechanism for more climate resilient farming, whilst increasing soil carbon levels.

Technical Application

While agroforestry practices are deemed highly beneficial and climate smart, it is important to ensure that proposed practices are appropriate for the specific context – the benefits of the agroforestry practice match the needs of the farmer - and are fit for purpose. Obtain advice from an agroforestry expert before embarking on secondary crop/hedge species selection.

To effectively implement alley-cropping the following should be carried out:

  • Step 1: Clearly understand the objectives of the intervention and identify an appropriate species for intercropping. For maize and sorghum in a smaller subsistence farm setting, selection and growth of hedge rows of a legumes such as cowpea or Gliricidia can provide sustainable benefits in terms of soil quality and secondary fodder/food products. In larger fields, timber trees can be planted every five to ten crop rows, depending on the height of the mature tree, and the shade-tolerance of the crop.
  • Step 2: Identify and understand key conditions, such as prevailing wind direction, and sunlight to ensure that the field is planted in an appropriate configuration, with primary crop and secondary (hedge/shrub/tree) crops planted in such a way as to benefit the primary crop and not compete with it. East to west row orientation should maxmise sunlight, topography permitting.
  • Step 3: For beneficial hedgerow growth with legume species such as Leucaena, cliricidia, and Sesbania sesban, the trees should be planted in rows between two and four metres apart, with individual trees planted as close as possible - between 10 to 15 cm apart. If planted closely, the trees will favour leaves over step growth, creating more mulch to prune for cover. Note that if rows are planted too closely, the secondary crop can dominate the available crop land reducing productivity. Furthermore, the closer the hedges, the more shade will present, which can depress crop growth, and also start to compete for soil water and nutrients, which is not beneficial.
  • Step 4: Once reaching sufficient maturity, after approximately six months (one-metre tall for legumes)– hedges should be pruned to generate mulch for working into the soil. Then the primary crop (maize) can be planted. Pruning once per month thereafter provides cover and ensures that light penetration is maintained. Planting legumes approximately six months before planting the primary crop can ensure that sufficient pruned material is available to incorporate into the soil to enhance growth.
  • Step 5: After harvesting the primary crop, hedgerows can be left to grow taller so that shade reduces weed grown, and to develop material to prune and incorporate into the soil again during the following crop cycle. However, hedges should not be allow to grow too high or dense as their roots will dominate the soil and out-compete primary crops for water and nutrients.

Before implementing any of these technologies, further research may be required beyond the guidance provided here. The World Agroforestry Centre (ICRAF) has many resources, toolkits and success stories that can support such research.

Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Alley cropping and pruning of leguminous hedges increases productivity of primary crops such as maize.
Increase Resilience
Helps farmers to be more resilient to climate change, by sustaining productivity and controlling soil health, especially when faced with changing climates.
Mitigate Greenhouse Gas Emissions
The planting of alley hedge rows of legumes and the introduction of pruned material contributes more carbon to the soil.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_17_AgroForestry_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Trees, shrubs, and hedges are incorporated into farming systems and have many different biophysical and socio-economic benefits.
  • Use of leguminous hedges no only provides pruned materials to provide cover, but they also help fix nitrogen in the soil.
  • Hedges planted in alleys can also provide other benefits such as edible seed pods for human or animal consumption.
  • Hedges and trees can reduce soil erosion from run-off or wind erosion.
  • Alley cropping can provide opportunities for diversified income – selling secondary crops and/or timber.
  • Alley cropped timber trees can provide building materials fire wood.

Drawbacks

  • Initial labour requirements will likely be significant; however, this will be primarily at the earlier stages of the intervention.
  • Ongoing maintenance such as pruning and maintenance of hedges will be needed, although relatively minimal.
  • There may be some costs involved in obtaining hedge seedlings.
  • Use of trees rather than hedges and shrubs introduces more labour, but yields more benefits.

Contour Planting

Value Chain
Annual Average Rainfall
Soils
Climatic Zone
Water Source
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Contour Planting is a planting strategy for sloping fields, where crop rows follow slope contours rather than planting in rows up- and down-slope. The primary aim of this strategy is to slow the downhill flow of water and encourage the infiltration of water into the soil. Slowing the flow of runoff water reduces soil erosion and therefore also nutrient loss.

Contour Ridges are created by tilling, ploughing or hoeing soil to establish ridges along contour lines, acting as a barrier to downhill water runoff and other erosive processes - the higher the ridge height, the more effective the barrier is to preventing soil erosion.

Contour Strips involves use of vegetative barriers e.g. planting of strips of grass or hedges and other species to secure soil and further prevent erosion. These practices are labour intense and require extension support, especially as contour lines are not straight but follow slope characteristics, correctly identifying contour lines is important and can be done using the ‘low-technology’ options that are identified in the Technical Application section of this Technical Brief.

Technical Application

To effectively undertake contour planting:

  • Step 1: Construct an A-frame that has a plumb-line with a rock hanging down the centre. The base of the A-frame should be 90 cm.
  • Step 2: Calibrate the A-frame on flat ground. Ensure that both legs are on the ground. Mark where the plumb line meets the cross bar.
  • Step 3: On a slope, working perpendicular to the slope, plant one leg of the A-frame and swing the other leg around until the plumb line meets the mark on the cross bar. Drive a stake into the ground where the first ‘planted’ leg is and continue the process across the slope.
  • Step 4: Once the extent of the contour has been staked, tie a string from post-to-post across the slope; this identifies the contour to be planted.
  • Step 5: Plant selected crops, develop contour ridges or plant contour strips along the contour line.
  • Step 6: Subsequent contours should be spaced 3-5 m up or downhill of the preceding contour line. To determine the length between contour lines, measure off the top of each stake to a stake up or downhill with a tape measure or accurately measured third stick.
  • Step 7: Contour ridges can be implemented like Water Spreading Bunds (Technical Brief 28) to form ridges of soil that are formed by tilling or ploughing and can be left after land preparation to further prevent erosive forces. Crops can be planted between these ridges.
  • Step 8: The planting of contour strips can be implemented by planting grasses or hedges 20 m (shallow slopes) to 10 m (steeper slopes) apart up or downhill, similar to Trash Lines (Technical Brief 14). This intercropping allows for erosion control and can be used as fodder for livestock.
Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Retaining soil structure enables farmers, particularly those planting on sloping fields to maintain productivity.
Increase Resilience
This land management practice aid farmers to maintain soil structure in the face of changing climates and shifting rainfall patterns.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_16_ContourPlanting_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Contour planting prevents erosion on sloped fields and efficiently trap runoff water.
  • Contour planting improved water infiltration and contour ridges improve water retention.
  • Contour planting can be integrated with intercropping contour strips of grass or hedges to help maintain soil structure.

Drawbacks

  • Contour lines are extremely labour intensive and take a significant amount of time to implement.
  • During contour measuring and development, land may be exposed to erosive forces.

Cover Crops

Value Chain
Annual Average Rainfall
Climatic Zone
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Cover Crops are incorporated into farming systems and planted in between growing seasons with the primary purpose of preventing soil erosion and improving nutrient content, and promoting soil quality in general, rather than being planted as a regular food or cash crop. Cover crops can also be utilised for food stuff, fodder or cash crops; but these outcomes are usually secondary to the main aim of improving/retaining soil quality. An additional benefit from growing cover crops is reduction in weed growth, and pests and diseases; increases in water availability in the soil; and increased soil biodiversity. Additional benefits are recognised from cover crops in areas with steep slopes, as the retained plant cover contributes to reducing erosion. Cover crops can be combined with other practices including intercropping practices and erosion control measures to further enhance soil quality and structure. Incorporating cover crops into farming systems increases farmers resilience to climate impacts through improving soils, reducing fossil fuel consumption, and increasing soil carbon sequestering. Extension guidance can be beneficial when selecting relevant cover crops to achieve the above outcomes.

Technical Application

To effectively implement cover crops:

  • Step 1:  Research whether locally available crops (especially legumes) provide potential options for cover crops.
  • Step 2: Establish a demonstration plot could provide farmers with an example of how cover crops function.
  • Step 3: Plant cover crops between primary crop growing systems to improve soil fertility, quality and nutrients.
  • Step 4: Monitor soil structure, nutrient levels, and field integrity to ensure efficacy.
  • Step 5: Incorporate cover crops with other climate smart practices enhance soil, including: Intercropping (Technical Brief 07), Crop Rotations (Technical Brief 09) Reduced/No-tillage Options (Technical Brief 12) etc
Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Cover crops improve soil conditions, providing an enabling environment for agricultural productivity.
Increase Resilience
In changing climates, cover crops can contribute to adaptation strategies, improving soil health.
Mitigate Greenhouse Gas Emissions
Retains and improves soil quality, including carbon sequestration.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_15_CoverCrops_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Cover crops protect soils from erosion and prevent soil nutrient loss.
  • Preventing weed growth, control pests and disease, increase water availability in the soil and increase soil biodiversity.
  • Cover crops may be non-traditional food crops, fodder and/or cash crops.
  • Low cost option for protecting soils and improving soil fertility.

Drawbacks

  • May take time to determine suitable to improve soils.
  • May increase labour demands as new or unfamiliar crops are incorporated into farming systems.

Erosion Control

Value Chain
Topography
Climatic Zone
Water Source
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

Erosion control measures are practices designed to reduce runoff water and wind erosion that wash away top soil and nutrients, degrading soil biodiversity and reducing agricultural productivity. Erosion is a natural, biophysical process resulting from rainfall, water flows, wind, or storm runoff. Erosion is integral to the formation of soils, however human and animal activity, including agriculture and clearing of land, can accelerate erosive processes, drastically impacting landscapes, soils (e.g. quality) and watercourses. In addition, erosion control measures can contribute to reducing rainfall runoff, increased water infiltration into the soil, and attenuates flooding. The intensity of rainfall is directly correlated with the severity of soil erosion; hence, this is a significant problem across the Southern African region as much of the rainfall in the region is episodic, and intense. To prevent or reduce erosive processes control measures can be incorporated into farming systems to reduce or reverse degradation and potentially restore or improve soil quality. Erosion control measures aim to mitigate soil erosion and improve soil fertility by reducing flow and speed of run-off to avoid soil being washed away. Erosion control can be initiated through a number of interventions, including, but not limited to, intercropping (e.g. planting cover crops), mulch, conservation tillage and reforestation, as well as terracing, soil bunds, etc.. Example: Stone Bunds. Lessons learned from West Africa show that stone bunds constructed along contour lines in fields and in key run-off locations can significantly reduce run-off, particularly in steeper agricultural fields. The stone lines reinforce the soil structure in the field following the contours of the land, reducing the speed and volume of run-off, thereby reducing the likelihood of erosion. This is an appropriate technology to implement on slopes up to 15 to 20 degrees. This is considered a climate smart practice as it maintains soil structure and nutrients, in turn retaining carbon in soil, enabling farmers to adapt to climate changes and sustain agricultural productivity.

Technical Application

Without a topographic survey, this technology may require trial and error to begin with, to see how rainfall and run-off responds to the contouring. To effectively implement erosion control measures the following should be carried out:

  • Step 1: Perform a thorough local study of the landscape, soils, land use and erosive processes that most impact the area: steep slopes, flood plains, high winds etc.
  • Step 2: Source a large number of stones, preferably five to ten centimetres square blocks (from a quarry) or five to ten-centimetre diameter cobbles (from a river-bed). You will need 30 to 50 tonnes of stone per hectare for contour bunds approximately 300 metres long.
  • Step 3: Mark out contours, as discussed in Technical Brief 16 Contour Planting.
  • Step 4: In larger fields with shallower slopes, place stones in rows of two along contour line, interlocking alternately, burying the lower half. The bunds can be between 25 and 40 metres apart. On steeper slopes, stack and bury stones against or in vertical/near vertical walls of contours much closer together (five to ten metres apart) to reinforce them.
  • Step 5: Make sure that stone bunds follow the contours from one side of the field to the other, ensuring that no ‘pour’ points (larger gaps) exist along the way, lining the drainage channel or weir from one contour to the next with stones to avoid or reduce scouring in these locations.
  • Step 6: Following, and if possible, during rainfall events, check the stability of the slope, adjusting stone bunds where necessary.
  • Step 7: At the end of the rainy season and again following harvest, review the performance of the technology, and prepare for the next growing season.
Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Increased water infiltration can extend growing period and mitigates short dry spells. Can reduce flood risk downstream.
Increase Resilience
Increased production due to improved nutrient availability and higher nutrient use efficiency.
Mitigate Greenhouse Gas Emissions
Depending on practices used, may lock more carbon into the soil.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_11_ErosionControl_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Erosion control measures prevent the loss of top soils and nutrients.
  • Can help farmers adapt to changes in climate that have include increased rainfall amounts and intensity.
  • Can reduce the impact of wind erosion.

Drawbacks

  • Erosion is a natural process that can be increased due to human and animal activity.
  • Requires substantial labour inputs to construct bunds and other erosion control measures
  • Maintenance is also needed.

No Tillage

Value Chain
Annual Average Rainfall
Soils
Climatic Zone
Water Source
Decision Making
Farming Characteristics
Mechanisation
Labour Intensity
Initial Investment
Maintenance Costs
Access to Finance/Credit
Extension Support Required
Access to Inputs
Access to Markets
Gender/Youth Smart
Description

No-tillage or reduced-tillage farming involves growing crops without ploughing or reducing the use of machinery in preparing fields for planting. Excessive tillage can have major impacts on soils and the environment including loss of organic matter and soil organisms, increased soil erosion and pesticide runoff, reduced soil fertility, loss of soil structure, etc. Thus, implementing no- or reduced-tillage can help farmers in conserving soil quality and in many cases, increase crop production.

In implementing no-tillage processes, land is not or is minimally disturbed and crop residues are normally left on the soil surface with minimal use of implements. Reduced tillage practices include technological changes such as using more efficient ploughing tools and/or implementing strip-till, zone-till or ridge-till processes. Most reduced tillage systems are implemented in conjunction with cover crops and mulches to protect soil structure.  Tilling by hand or animal means are considered reduced tillage methods.

The adoption of no or reduced tillage practices reduces the amount of fossil fuels consumed by farmers and increases carbon sequestration as soil carbon is not exposed or released in the atmosphere and is thus a climate smart practice.

Technical Application

Switching to no-till or reduced tillage should be planned at least a year in advance so preparations can be made necessary implements can be obtained. Implements should match farm labour availability. You will also need to decide if no till or reduced tillage methods are appropriate based on farm area and desired crops, and start with a small area to determine feasibility. Cereal and legume crops are suitable for no tillage while vegetables and other crops often require some tillage – i.e. reduced tillage.

There are two forms of no-tillage, conventional and organic. Conventional no-tillage includes the application of herbicides to manage weeds, prior to and after planting. Organic no-tillage does not incorporate the use of herbicides, but includes other methods for controlling weeds, including cover crops, crop rotation and free-range livestock. Organic no-tillage is more suitable as it assists mitigate any climate change impacts on the farm.

No till

  • Step 1: Prepare fields using conventional (herbicide application) or organic processes include cover crop (Technical Brief 15) and crop rotation (Technical Brief 09).
  • Step 2: Test soils – aiming to balance nutrient and pH levels. In the case of acidic soils, add small amounts of lime each year.
  • Step 3: Avoid soils with bad drainage, as they become water-logged.
  • Step 4: Level the soil surface, removing uneven areas to assist even seed planting.
  • Step 5: Eliminate soil compaction.

Reduced Till

  • Step 1: This approach is similar to regular tillage, but with significantly less disturbance of the soil. Tilling is only done where needed, and the rest of the soil is undisturbed.
  • Step 2: Strip-tillage or zone-tillage involves tilling and seeding in 15 cm strips leaving areas in-between undisturbed.
  • Step 3: Ridge-tillage involves preparing ridges post-harvest and letting them settle over time to be planted the next seeding period; with ridges not more than 60 cm apart.

More information of each of these specific practices should be sought prior to implementation.

Crop rotation is a complimentary farming method when practicing no-tillage, as it promotes maximum biomass levels for permanent mulch cover, while controlling weeds (with pre- and post-emergent herbicides), pests, and diseases, as well as improving soil nutrition and fertility.

Return on Investment Realisation Period
Crop Production
Fodder Production
Farm Income
Household Workload
Food Security
Soil Quality/Cover
Biological Diversity
Flooding
Crop/Livestock Water Availability
Wind Protection
Erosion Control
Increase Production
Improved soil structure and increased microbial and invertebrate activity in the soil makes nutrients more available to plants.
Increase Resilience
Increased water infiltration and soil biodiversity mitigates the effects of short-term dry spells.
Mitigate Greenhouse Gas Emissions
Locks more carbon in the soil. Reduced ‘passes’ in mechanised systems reduces fuel inputs required.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_12_No%20Tillage_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Increased soil fertility, organic matter and soil structure, and beneficial organisms (earthworms, etc).
  • Reduced compaction of soils.
  • Prevention of soil erosion.
  • Reduction in fossil fuel consumption.
  • Increased soil carbon sequestration.

Drawbacks

  • A positive response can be delayed for up to three years.
  • Effective weed management may require the application of herbicides.
  • Possible decreases in crop productivity if not carried out effectively.
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