Technologies

Mulching [Kenya]

Mulching

technologies_1318 - Kenya

Completeness: 80%

1. General information

1.2 Contact details of resource persons and institutions involved in the assessment and documentation of the Technology

Key resource person(s)

SLM specialist:
SLM specialist:

Gathenya Mwangi

Jomo Kenyatta University of Agriculture and Technology

Kenya

SLM specialist:

Home Patrick

Jomo Kenyatta University of Agriculture and Technology

Kenya

SLM specialist:

Chege Timothy

Jomo Kenyatta University of Agriculture and Technology

Kenya

SLM specialist:

Wamuongo Jane

Kenya Agricultural Research Institute

Kenya

SLM specialist:

Karanja Andrew

Kenya Agricultural Research Institute

Kenya

Name of the institution(s) which facilitated the documentation/ evaluation of the Technology (if relevant)
Jomo Kenyatta University (Jomo Kenyatta University) - Kenya
Name of the institution(s) which facilitated the documentation/ evaluation of the Technology (if relevant)
KARI Headquarters (KARI Headquarters) - Kenya

1.3 Conditions regarding the use of data documented through WOCAT

The compiler and key resource person(s) accept the conditions regarding the use of data documented through WOCAT:

Yes

1.4 Declaration on sustainability of the described Technology

Is the Technology described here problematic with regard to land degradation, so that it cannot be declared a sustainable land management technology?

No

2. Description of the SLM Technology

2.1 Short description of the Technology

Definition of the Technology:

Mulching is done by covering the soil surface between crop rows, around trees (mostly fruit and orchard) or vegetables with cut grass, crop residues, straw or other plant material in order to retain soil moisture, prevent or suppress weed growth and enhance soil structure.

2.2 Detailed description of the Technology

Description:

A layer of crop residues, cut grass, straw or other plant material is spread on the soil surface between crop rows or around the vegetables or orchard trees in order to retain the soil moisture by limiting evaporation, prevents weed growth and enhances soil structure. Farmers in the Upper Tana Catchment mostly uses crop residues as mulch especially after the harvesting season. Banana leaves in Embu county are used as mulch on banana plants.

Purpose of the Technology: Mulching is mostly used in the Upper Tana Catchment to retain soil moisture by limiting evaporation, it also prevents weed growth and enhances soil structure. It is commonly used in areas that are mostly affected by drought and weed infestation. In Embu District, mulch on banana plantations is supplemented with farm yard manure as shown in the photographs above. The most readily available source of mulching materials is banana leaves themselves even though other type of mulch materials are also in use. Some farmers use the these leaves both as mulch and as livestock feeds during the drought seasons.

Establishment / maintenance activities and inputs: The mulch layer is rougher than the surface of the soil and thus inhibits runoff. The layer of plant material protects the soil from splash erosion and limits the formation of soil crust. It is worth to note that the choice of mulch depends on locally available materials. In alley-cropping systems, hedgerow biomass is often used as mulch. Another strategy is to leave crop residues, such as maize stalks on the ground after harvesting. Mulch can be spread on a seedbed or around planting holes. Large pieces of crop residues should be cut into smaller pieces before spreading on the soil's surface. There are many advantages of using mulch which include, increase of soil moisture, reduction of excessive evaporation from the soil surface, suppression of weeds which further reduces labour cost of weeding. Mulching reduces high fluctuations in soil temperature, which means improved conditions for microorganisms in the soil. It also increases soil organic matter and thereby improves soil structure. Mulch protects the soil against splash erosion and runoff. The disadvantages of mulch includes the following; unavailability of suitable materials for mulch, some seeds of mulch might germinate and become weed problem. If crop residues are used as mulch it might mean a loss of animal fodder. Especially in the drier parts of Mbeere district, dry mulch has been reported as fire hazard. Sometimes it is difficult to spread mulch on steep slopes and it can also be a possible habitat for pests and diseases.

Natural / human environment: Areas with limited rainfall usually respond very well to mulching. Mulching is not applicable in wet conditions however, the soils should have good drainage.

2.3 Photos of the Technology

2.5 Country/ region/ locations where the Technology has been applied and which are covered by this assessment

Country:

Kenya

Region/ State/ Province:

Eastern Province

Further specification of location:

Embu North District

Specify the spread of the Technology:
  • evenly spread over an area
If precise area is not known, indicate approximate area covered:
  • 1-10 km2
Comments:

Most of the farmers use mulch from their crop residuals

2.6 Date of implementation

If precise year is not known, indicate approximate date:
  • 10-50 years ago

2.7 Introduction of the Technology

Specify how the Technology was introduced:
  • through land users' innovation

3. Classification of the SLM Technology

3.1 Main purpose(s) of the Technology

  • improve production
  • conserve ecosystem
  • preserve/ improve biodiversity
  • create beneficial economic impact

3.2 Current land use type(s) where the Technology is applied

Cropland

Cropland

  • Annual cropping
  • Perennial (non-woody) cropping
  • Tree and shrub cropping
Annual cropping - Specify crops:
  • cereals - maize
  • fodder crops - grasses
  • vegetables - other
Perennial (non-woody) cropping - Specify crops:
  • banana/plantain/abaca
  • coffee
Number of growing seasons per year:
  • 2
Specify:

Longest growing period in days: 180, Longest growing period from month to month: April to October

Comments:

Major land use problems (compiler’s opinion): Soil erosion, weed infestation and excessive evaporation in the farm lands
Major land use problems (land users’ perception): Low soil fertility and excessive evaporation of soil moisture

3.4 Water supply

Water supply for the land on which the Technology is applied:
  • rainfed

3.5 SLM group to which the Technology belongs

  • improved ground/ vegetation cover

3.6 SLM measures comprising the Technology

agronomic measures

agronomic measures

  • A2: Organic matter/ soil fertility
Comments:

Type of agronomic measures: mulching, manure / compost / residues

3.7 Main types of land degradation addressed by the Technology

soil erosion by water

soil erosion by water

  • Wt: loss of topsoil/ surface erosion
chemical soil deterioration

chemical soil deterioration

  • Cn: fertility decline and reduced organic matter content (not caused by erosion)
Comments:

Main causes of degradation: crop management (annual, perennial, tree/shrub)
Secondary causes of degradation: soil management, deforestation / removal of natural vegetation (incl. forest fires), overgrazing

3.8 Prevention, reduction, or restoration of land degradation

Specify the goal of the Technology with regard to land degradation:
  • prevent land degradation
  • reduce land degradation

4. Technical specifications, implementation activities, inputs, and costs

4.1 Technical drawing of the Technology

Technical specifications (related to technical drawing):

The technical drawing on the left shows banana trees planted on benches. Fodder grass that is used to feed livestock is planted to stabilize the slopes. FYM is first spread at the base and latter covered with mulch made from the banana leaves.

Location: Embu North. Eastern Province
Date: 06/09/2016

Technical knowledge required for field staff / advisors: low
Technical knowledge required for land users: high

Main technical functions: control of raindrop splash, control of dispersed runoff: retain / trap, improvement of ground cover, increase of infiltration
Secondary technical functions: control of dispersed runoff: impede / retard, control of concentrated runoff: retain / trap, increase of surface roughness, increase in organic matter, increase of groundwater level / recharge of groundwater, reduction in wind speed

Mulching
Material/ species: Banana leaves
Quantity/ density: 2
Remarks: mulch is spread on the surface surrounding the banana trees

Manure / compost / residues
Material/ species: Farmyard Manure
Quantity/ density: 1
Remarks: Farm yard manure is first applied around the banana tree then the mulch is spread over

Author:

Paul Kahiga, 62000-00200 Nairobi

4.2 General information regarding the calculation of inputs and costs

other/ national currency (specify):

Kshs.

If relevant, indicate exchange rate from USD to local currency (e.g. 1 USD = 79.9 Brazilian Real): 1 USD =:

100.0

Indicate average wage cost of hired labour per day:

400.00

4.3 Establishment activities

Activity Timing (season)
1. Apply banana leaves and FYM
Comments:

Lifespan of the leaves: 1 year

4.4 Costs and inputs needed for establishment

Specify input Unit Quantity Costs per Unit Total costs per input % of costs borne by land users
Labour Labour ha 1.0 50.0 50.0 100.0
Equipment Tools ha 1.0 10.0 10.0 100.0
Fertilizers and biocides Compost/manure ha 1.0 10.0 10.0 100.0
Total costs for establishment of the Technology 70.0
Total costs for establishment of the Technology in USD 0.7
Comments:

Duration of establishment phase: 1 month(s)

4.5 Maintenance/ recurrent activities

Activity Timing/ frequency
1. Cutting the banana leaves and applying FYM one in every six months

4.6 Costs and inputs needed for maintenance/ recurrent activities (per year)

Specify input Unit Quantity Costs per Unit Total costs per input % of costs borne by land users
Labour Cutting the banana leaves and applying FYM ha 1.0 4.0 4.0 100.0
Equipment Tools ha 1.0 10.0 10.0 100.0
Fertilizers and biocides Compost/manure ha 1.0 5.0 5.0 100.0
Total costs for maintenance of the Technology 19.0
Total costs for maintenance of the Technology in USD 0.19
Comments:

Machinery/ tools: Pangas to cut the leaves, shovels and wheels barrows to carry the FYM
number of mulched banana plants

4.7 Most important factors affecting the costs

Describe the most determinate factors affecting the costs:

Labour and availability of mulch determines the cost of the technology

5. Natural and human environment

5.1 Climate

Annual rainfall
  • < 250 mm
  • 251-500 mm
  • 501-750 mm
  • 751-1,000 mm
  • 1,001-1,500 mm
  • 1,501-2,000 mm
  • 2,001-3,000 mm
  • 3,001-4,000 mm
  • > 4,000 mm
Agro-climatic zone
  • sub-humid

5.2 Topography

Slopes on average:
  • flat (0-2%)
  • gentle (3-5%)
  • moderate (6-10%)
  • rolling (11-15%)
  • hilly (16-30%)
  • steep (31-60%)
  • very steep (>60%)
Landforms:
  • plateau/plains
  • ridges
  • mountain slopes
  • hill slopes
  • footslopes
  • valley floors
Altitudinal zone:
  • 0-100 m a.s.l.
  • 101-500 m a.s.l.
  • 501-1,000 m a.s.l.
  • 1,001-1,500 m a.s.l.
  • 1,501-2,000 m a.s.l.
  • 2,001-2,500 m a.s.l.
  • 2,501-3,000 m a.s.l.
  • 3,001-4,000 m a.s.l.
  • > 4,000 m a.s.l.

5.3 Soils

Soil depth on average:
  • very shallow (0-20 cm)
  • shallow (21-50 cm)
  • moderately deep (51-80 cm)
  • deep (81-120 cm)
  • very deep (> 120 cm)
Soil texture (topsoil):
  • medium (loamy, silty)
Topsoil organic matter:
  • high (>3%)
If available, attach full soil description or specify the available information, e.g. soil type, soil PH/ acidity, Cation Exchange Capacity, nitrogen, salinity etc.

Soil fertility: Medium
Soil drainage/infiltration: Good
Soil water storage capacity: Medium

5.4 Water availability and quality

Ground water table:

5-50 m

Availability of surface water:

good

Water quality (untreated):

good drinking water

5.5 Biodiversity

Species diversity:
  • high

5.6 Characteristics of land users applying the Technology

Market orientation of production system:
  • mixed (subsistence/ commercial)
Off-farm income:
  • less than 10% of all income
Relative level of wealth:
  • average
Individuals or groups:
  • individual/ household
Level of mechanization:
  • manual work
  • mechanized/ motorized
Gender:
  • women
  • men
Indicate other relevant characteristics of the land users:

Land users applying the Technology are mainly common / average land users
Difference in the involvement of women and men: no
Population density: 10-50 persons/km2
Annual population growth: 0.5% - 1%
Off-farm income specification: Few farmers have shops/kiosks that they use to supplement their income other than farming

5.7 Average area of land used by land users applying the Technology

  • < 0.5 ha
  • 0.5-1 ha
  • 1-2 ha
  • 2-5 ha
  • 5-15 ha
  • 15-50 ha
  • 50-100 ha
  • 100-500 ha
  • 500-1,000 ha
  • 1,000-10,000 ha
  • > 10,000 ha
Is this considered small-, medium- or large-scale (referring to local context)?
  • small-scale

5.8 Land ownership, land use rights, and water use rights

Land ownership:
  • individual, titled
Land use rights:
  • individual
Water use rights:
  • individual

5.9 Access to services and infrastructure

health:
  • poor
  • moderate
  • good
education:
  • poor
  • moderate
  • good
technical assistance:
  • poor
  • moderate
  • good
employment (e.g. off-farm):
  • poor
  • moderate
  • good
markets:
  • poor
  • moderate
  • good
energy:
  • poor
  • moderate
  • good
roads and transport:
  • poor
  • moderate
  • good
drinking water and sanitation:
  • poor
  • moderate
  • good
financial services:
  • poor
  • moderate
  • good

6. Impacts and concluding statements

6.1 On-site impacts the Technology has shown

Socio-economic impacts

Production

crop production

decreased
increased

risk of production failure

increased
decreased
Income and costs

expenses on agricultural inputs

increased
decreased

farm income

decreased
increased

Socio-cultural impacts

SLM/ land degradation knowledge

reduced
improved

Improved livelihoods and human well-being

decreased
increased
Comments/ specify:

It has contributed to soil erosion control through improved ground cover, reduction of splash by rain drops. Improved soil fertility and moisture content of the top soil and increase of yield.

Ecological impacts

Water cycle/ runoff

evaporation

increased
decreased
Soil

soil moisture

decreased
increased

soil cover

reduced
improved
Biodiversity: vegetation, animals

pest/ disease control

decreased
increased
Comments/ specify:

Rats and squeals can hide in the mulch before decomposition

6.2 Off-site impacts the Technology has shown

downstream flooding

increased
reduced

downstream siltation

increased
decreased

6.3 Exposure and sensitivity of the Technology to gradual climate change and climate-related extremes/ disasters (as perceived by land users)

Gradual climate change

Gradual climate change
Season increase or decrease How does the Technology cope with it?
annual temperature increase well

Climate-related extremes (disasters)

Meteorological disasters
How does the Technology cope with it?
local windstorm well
Climatological disasters
How does the Technology cope with it?
drought well
Hydrological disasters
How does the Technology cope with it?
general (river) flood not known
Comments:

Addition of FYM before the mulch enhances retaining of moisture

6.4 Cost-benefit analysis

How do the benefits compare with the establishment costs (from land users’ perspective)?
Short-term returns:

positive

Long-term returns:

positive

How do the benefits compare with the maintenance/ recurrent costs (from land users' perspective)?
Short-term returns:

positive

Long-term returns:

positive

Comments:

After decomposition, the rich organic matter and nutrients remains in the soil for long time.

6.5 Adoption of the Technology

Comments:

There is a moderate trend towards spontaneous adoption of the Technology

6.7 Strengths/ advantages/ opportunities of the Technology

Strengths/ advantages/ opportunities in the land user’s view
Crop materials for mulch are available on site i.e banana leaves
Strengths/ advantages/ opportunities in the compiler’s or other key resource person’s view
Mulch in banana plantations is generally easy to be established and to maintain.
Mulch in banana plantations reduces rain drop's splashing energy thus reduces loss of top soil which could occur due to splash of the rain drops.
After sometime, the mulch materials eventually rots and becomes manure thus improving soil organic matter

6.8 Weaknesses/ disadvantages/ risks of the Technology and ways of overcoming them

Weaknesses/ disadvantages/ risks in the land user’s view How can they be overcome?
Habours termites and pests before complete decomposition. Use of biodegradable insecticides incase of infestation of termites and other pests.
Weaknesses/ disadvantages/ risks in the compiler’s or other key resource person’s view How can they be overcome?
In absence of other supplemental materials, mulch in banana plantations requires regular replacement due to continuous decomposition. supplementing of the banana leaves with other crop residues.

7. References and links

7.1 Methods/ sources of information

  • field visits, field surveys
  • interviews with land users
When were the data compiled (in the field)?

09/02/2011

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