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Banding and Micro Dosing

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

While rotating crops or leaving fields fallow for several growing seasons is good practice, some farmers do not have this luxury, needing to continue planting season upon season. However, this practice will soon see soils depleted of nutrients. In these cases, use of green manure, and organic fertilisers is recommended. In. the last-resort cases where chemical fertilisers must be used, banding and micro-dosing are approaches that rationalise or minimise application. Banding is the agricultural practice of placing fertiliser in a row below soil surface, covering with soil and planting seeds above the fertiliser, whereas Micro-dosing – sometimes referred to as ring-placement - is the practice of placing small, more affordable amounts of fertiliser around each crop plant. Banding is a common method used for basal fertiliser applications and uses less fertiliser than broadcasting as it is applied in rows rather than throughout the whole field. Micro-dosing is applicable where plants are widely spaced and where soil increases the chances of nutrient loss due to leaching. While the use of chemical fertilisers is not strictly considered climate smart, these practices promote economic and rationalised application of fertilisers, reducing greenhouse gas emissions, whilst improving resilience in the face of climate change, and providing options for maintain agricultural productivity.

Technical Application

To effectively leverage banding and micro-dosing for maize and sorghum, the following should be carried out. When handling fertilisers, always ensure that safety precautions provided on the packaging are followed.

Banding – suitable when wishing to save on fertiliser expenditure, but still need to improve production of primary and secondary crops.

  • Step 1: Plough the field using a draught animal-drawn or mechanised plough to carefully open furrows. Depending on availability of mechanised equipment, a narrow hoe can also be used if manual labour is favoured. This can reduce workload and minimise soil disturbance but may require more effort.
  • Step 2: Count furrows and measure length to ensure that you have sufficient fertiliser for area, based on recommended application amounts (see packaging or see advice from supplier).
  • Step 3: Apply fertilisers as a strip or line (band) along the furrow.
  • Step 4: Turn furrow back over ensuring that the fertiliser is present at a depth of 5-8cm below the soil surface and covered by the soil. The basal fertiliser should not touch the seed as it may burn it and disturb its germination.

Micro-dosing: suitable when fertiliser is in short supply.

  • Step 1: in the field, at the time of planting, prepare small pits 5 to 8 cm deep where each seed is to be placed.
  • Step 2: measure approximately 6 grams of fertiliser using a bottle cap or a three-finger pinch.
  • Step 3: place the micro-dose in the small pits.
  • Step 4: cover fertiliser with a small amount of soil, then place the seed. Cover fully with soil and water, or allow rain to wet the ground.
  • Where manure is available, Zai pits can be used to improve organic matter at the same time. Prior to planting, dig the small pit and fill with manure. When rains begin, fertiliser and seed are placed in the hole and covered.
  • The practice includes the advantage of banding by placing the fertiliser below the seed but at a single point instead of a row.
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
While seen as a last resort, these focused applications of chemical fertilisers can lead to sustained agricultural productivity.
Increase Resilience
In some areas, use of fertilisers is unavoidable, especially in areas impacted by climate change.
Mitigate Greenhouse Gas Emissions
These economical uses of fertiliser minimise or rationalise fertilisers, reduce contributions to GHG emissions.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_66_BandingAndMicroDosing_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Banding is the most commonly used method for basal fertiliser applications, and it uses much less fertiliser as it is applied in rows.
  • Micro-Dosing maintains and increases crop production with less fertiliser, crops become less susceptible to diseases/pests and reduces GHG emissions per kg of crop produce.
  • Micro-dosing has been known to double or even triple yields and plant biomass.
  • If using fertiliser, these approaches can save significantly on the cost of fertilisers, as is
  • Can be used to supplement organic fertilisers if in short supply.
  • Both techniques are more economic for smallholders.

Drawbacks

  • Use of chemical fertilisers has a cost attached.
  • Chemical fertilisers are not strictly a CSA approach.
  • Requires a sustainable supply of fertilisers.
  • If small-holders are purchasing fertilisers, they are often only available in 50 kg bags, which often make them economically inaccessible. Agriculture for development projects have been lobbying manufacturers to also provider smaller bags.
  • If 50 kg bags are purchased, fertiliser must be stored in cool dry place – following instructions on packaging.
  • Micro-dosing can be very time and labour intensive.

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.

Non-Conventional Feeds

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

Non-Conventional Feeds (NCF) are either traditional or commercial animal feed-types that are not traditionally utilised as animal feed. These feeds are generally in one of two categories: by-products of agroecological industrial processes, or plants/plant materials from other processes. Examples of industrial by-products include groundnut cake, molasses and cotton seed meal, which are outputs from other processes and are found in proximity of manufacturing points, but often have a short shelf-life. Plant materials can be vegetable peels or locally available crop residues such as maize stalks and other remaining parts of harvested plants not consumed by humans. NCF decrease the demand of land to grow fodder, act as an alternative source for animal feed, resulting in the decrease of food competition between animals and humans ensuring food security. Furthermore, the use of bi-products optimises the use of raw materials and can increase profitability for the producer and the farmer.

Technical Application

To effectively implement NCF practices:

  • Step 1: Determine potential sources of NCFs in the local area and consider if the potential products are suitable (provide enough energy, are digestible, palatable to livestock animals, etc) and require additional investment to access or use.
  • Step 2: Collect for free/negotiate lower rates with producers of agroecological industrial process biproducts or plant materials to gain access to their ‘waste’ materials.
  • Step 3: Determine how sustainable and consistent the supply will be from the providers. If possible, identify a range of suppliers to mitigate potential losses of stockpiled NCFs.
  • Step 4: Before being used as feed, NCF’s from agroecological processes must be appropriately processed - (grinding (8 mm) and pelleting) and mixed into a uniform blend. Hence, labour requirements may increase. This could be mechanised.
  • Step 5: Livestock should be monitored when these feeds are introduced to ensure digestibility of the product for the animals.
  • Step 6: Based on advice from the suppliers of agroecological industrial process biproducts, ensure appropriate storage of materials to avoid loss of nutrition, pests and waste.
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
Can supplement conventional feed to enhance productivity.
Increase Resilience
Reduces pressure on land to produce fodder.
Mitigate Greenhouse Gas Emissions
As these are by-products of industrial processes, no additional inputs to produce fodder are required.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_40_NonConventionalFeeds_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • The use of NCFs could be a cheap and good source of nutrients for livestock.
  • NCF act as an alternative source for animal feed, resulting in a decrease of food competition between animals and humans.

Drawbacks

  • NCF’s need to be handled properly to avoid formation of moulds that are not good for animal health.
  • Farmers need to acquire skills on how best to conserve these residues for animal consumption, like drying before storing to avoid the loss of nutritional value.

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.

Rainwater Harvesting

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

Rainwater harvesting is an agricultural technique of collecting and storing rainwater or runoff in tanks or natural reservoirs. This practice is mostly practiced in arid or semi-arid areas with temporal and spatial variability of rainfall mostly lost as surface runoff or evaporation. Runoff is harvested and utilised as a preventative measure for soil erosion, as well as a water management strategy for irrigating crops and for livestock water. This technique enables farmers to capture and store rainwater during times of plenty for use during times of scarcity. Rainwater harvesting is a technology that maximises the use of existing freshwater resources and is a useful technology for water resource planners and managers in both governmental and non-governmental organisations, institutions and communities.

Technical Application

To effectively implement Rainwater Harvesting practices:

  • Step 1: Create a water collection zone connected to a gutter system.
  • Step 2: Install filters to the water collection zone.
  • Step 3: Connect a hose pipe for easy distribution of irrigation water.
  • Step 4: If a farmer intends to use water for human consumption other than flushing toilets, etc, water quality must be frequently tested using reliable and low-cost/low-tech solutions.
  • Step 5: Use of filters can be considered to reduce particulate and other pollutants but should be thoroughly investigated – as a separate subject – by the extension officer and the farmer, otherwise it could lead to illness. It is recommended that farms utilise harvested rainwater for irrigation and other farming activities only.
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
More water available to plants when it is needed.
Increase Resilience
Mitigate dry spells.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_30_RainwaterHarvesting_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Rainwater harvesting acts as a source of water at a point where it is needed, usually stored in a tank.
  • Works as an alternative water source in cases of drought or irrigation system breakdown.
  • Rooftop rainwater catchment construction is simple.
  • Success in rainwater harvesting depends on frequency and amount of rainfall.

Drawbacks

  • Asphalt, tar and wood roofs may contaminate the water making it unsafe for direct human consumption.
  • For potable water collection, lead containing gutters should not be used.
  • Harvested water may be contaminated by animal waste.

Permeable Rock Dams

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

A permeable rock dam is a water harvesting technique where flooding rain water is collected in valley bases or other depressions to irrigate crops later/elsewhere, filling in gullies, controlling water flows, increasing crop production and reducing soil erosion.. Permeable rock dams are long and relatively shallow to reduce erosion while accumulating silt and distributing water. They comprise of long low rock walls with smooth crests so that water can spread to avoid overflow from the dam. However, this technology is site specific; it cannot be practiced in areas where there are no rocks/stones and means of transporting these building materials. The impoundment of silt prior to runoff entering a watercourse can be beneficiary to downstream users and can contribute to improved water quality in the catchment

Technical Application

To effectively implement Permeable Rock Dam practices, the following steps should be carried out:

  • Step 1: Consider constructing a permeable rock dam across relatively wide and shallow valleys.
  • Step 2: Permeable rock dams should consist of long, low rock walls with level crest along full length although farmers should consider central spillways where water course has cracks.
  • Step 3: The dam should be between 50-300m in length and 1m in height within a gully.
  • Step 4: Consider making the dam wall flatter on the downslope side than on the upslope side.
  • Step 5: A foundation of small stones should be set in the trench.
  • Step 6: An apron of large rocks is essential to split the erosive force of the overflow.
  • Step 7: Downstream banks of the water stream should be shielded by stone pitching to prohibit the increase of the gully.
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
Erosion Control
Increase Production
Supports agricultural productivity as soil structure is retained and provides access to more sustainable water supplies.
Increase Resilience
Supports adaptation strategies in climate changes scenarios with improved access to water for irrigation and reducing soil erosion.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_29_PermeableRockDams_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Permeable rock dams increase crop production.
  • Reduce soil erosion.
  • The system increases groundwater recharge.

Drawbacks

  • The technology is site specific; should be on a site where rocks and stones are present.
  • Need for large quantities of stone.

Water Spreading Bunds

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

Water spreading bunds are barriers used on gradual slopes to slow down surface water and slow filter runoff, increasing the chance of infiltration, capturing runoff sediment, and decreasing soil erosion. Bunds can be built of different materials including packed earth or stones. Bunds can be spread across fields or used in micro-settings around individual trees or plants and should be applied in semi-arid or arid conditions. Bunds efficiently spread rainwater across the system and prevent streams from developing. Implementing bunds in areas with adequate rainfall or irrigation, may cause waterlogging and adversely affect crop growth.

Different types of bunds include:

  • Contour bunds: ridges of soil that follow slope contours and can be implemented at a large scale. Crops are cultivated between bunds.
  • Semi-circle bunds: ridges of varying size build in a half-moon or semi-circle. They are generally applied to rehabilitate rangelands and/or in the production of fodder.
  • Contour stone bunds: lines of stones laid in a shallow dug out areas that slow down the flow of runoff
Technical Application

To effectively Water Spreading Bunds the following should be carried out:

  • Step 1: Farmers should consider making earth bunds by hand, animal ploughs or mechanised ploughs.
  • Step 2: Contour bunds:
    • Contour lines must be plotted and marked prior to developing the bund.
    • A 40 cm deep infiltration pit is dug directly above where the bund will be plotted.
    • Bunds should be spread 5 m to 10 m apart.
    • Material from the infiltration pit will be piled and compacted to form a 25 cm to 30 cm in height with a base of 75 cm.
    • Soil is piled to form a ridge along the contour. The more significant the slope, the closer the bunds must be plotted.
  • Step 3: Semi-circle bunds:
    • Contour lines must be plotted and marked prior to developing the bund.
    • A centre point is chosen as diameter for the bund is selected (this could be 3 m or 30 m depending on the available space). From the centre point a string is used to stake out an even semi-circle.
    • Excavate a small trench before the bund and pile the excavated material. Pile and compact a bund wall, wetting it often to form the wall.
  • Step 4: Contour stone bunds:
    • Developed on less steep slopes.
    • Must have access to local stones.
    • Dig out a shallow ditch, 10 cm to 15 cm in depth.
    • Lay largest stones at the bottom of the ditch and pile smaller stone upward.
    • Step 5: Regular monitoring of bunds should take place, especially after rain events or after significant periods of time. Repairs should be done if any damage is found.
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
Reduces soil erosion and enables farmers to maintain agricultural productivity.
Increase Resilience
Reduces soil erosion in higher rainfall environments, especially relevant as climates change.
Additional Information
  • The Food and Agriculture Organisation (FAO), 1991. Water Harvesting. Rome, Italy.
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_28_waterSpreading_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Water spreading bunds are implemented on slopes of varying degrees to slow the flow of surface water, increasing infiltration and nutrient capture.
  • Bunds capture water and spread it across an area more evenly, preventing streams, erosion channels and gullies from forming at depression points.

Drawbacks

  • Developing bunds can be laborious.
  • Bunds in areas with adequate rainfall or irrigation may cause waterlogging and affect crop growth.

Half Moon Pits

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

Half-moon Pits are water harvesting techniques that assists crop growth in harsh climatic conditions, improving water and nutrient availability, promoting biodiversity and restoring the fertility of the degraded soil. The technique is similar to Zai pits in terms of its purpose. Half-moons are semi-circular wide-open basins used to collect runoff water. The mouth of the half-moons must face a slope where rainwater will flow during precipitation events. Water will be trapped in the pit to irrigate crops. Stones are used to support the half-moon curve to avoid being washed away during rain. The amount of fertilisers required in farming systems decreases when this technique is adopted by farmers. Areas with lots of rainfall are not suitable for this technique as it may lead to water logging effect.

Technical Application

To effectively implement Half-moon techniques, the following steps should be carried out:

  • Step 1: Farmers should consider the diameter of the half-moon  between 2 m – 3 m, with a total surface area of approximately 1.5 sqm and 3.5 sqm.
  • Step 2: Pits should be dug to a depth of between 15 cm to 30 cm.
  • Step 3: Excavated material can be piled around the curved section of the half-moon.
  • Step 4: The curved section of the half-moon can be reinforced by stones to prevent washouts of the half-moon.
  • Step 5: 35 kg of organic fertilisers/compost should be evenly distributed in the half-moon.
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
Half moon pits support water and nutrient availability, in turn promoting agricultural productivity, especially in harsh climates.
Increase Resilience
Retaining soil water and nutrients supports agricultural productivity.
Additional Information
PDF File
/sites/secondsite/files/tb/CCARDESATechnicalBrief_27_HalfMoons_2019-10-17_0.pdf
Benefits and Drawbacks

Benefits

  • Pits are left to sit while fertiliser/compost material converts to productive soil material.
  • Half-moons allow for nutrient concentration and water infiltration that provides improved conditions for crops to grow.
  • Land that was previously degraded can become productive through the implementation of half-moons.

Drawbacks

Implementing half-moons is very laborious and takes significant people power to implement.

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Funding Partners

4.61M

Beneficiaries Reached

97000

Farmers Trained

3720

Number of Value Chain Actors Accessing CSA

41300

Lead Farmers Supported