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

Name of the institution(s) which facilitated the documentation/ evaluation of the Technology (if relevant)

EEZA-CSIC (EEZA-CSIC) - Spain

1.3 Conditions regarding the use of data documented through WOCAT

When were the data compiled (in the field)?

05/05/2011

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

Yes

1.5 Reference to Questionnaire(s) on SLM Approaches

2.1 Short description of the Technology

Definition of the Technology:

Organic mulching to protect against rain-splash, sheet wash and rill formation, reduce evaporation losses and weed growth.

2.2 Detailed description of the Technology

Description:

Organic mulch is applied in Almond fields to provide a permanent surface cover that protects the soil against soil erosion, reduces evaporation and limits the growth of weeds. This makes that less ploughing is needed under Almond trees that are normally ploughed 3-5 times per year if no mulch cover is present. The material used for mulching can be diverse. Most feasible are straw or bark and wood chips from pruning residues from almonds and forest species (mostly pines). Alternatively, alpha-grass can be used as mulch. Mulch can best be applied late spring or early summer in order to maintain soil humidity of spring rainfall. Mulch should come mixed and homogenised. It is spread around trees by a mechanical spade or by the arm of a caterpillar. A layer of maximum 3-5 cm of mulch should be applied for economical reasons.

Purpose of the Technology: The ultimate goal of organic mulching under almond trees is to maintain soil water through a reduced evaporation and reduce soil loss by erosion. A mulch covers reduces soil erosion by 1) reducing raindrop impact, 2) increasing water infiltration, 3) increasing surface storage, 4) decreasing runoff velocity, 5) improving soil structure and porosity, and 6) improving the biological activity in the soil. Mulching prevents off-site effects of erosion like flooding, damage to infrastructure and siltation of water reservoirs, while maintaining or slightly increasing crop productivity. The mulch results in a higher soil roughness, a better infiltration of water into the soil, and so also in a reduced runoff. The mulch also has a favorable effect on soil quality since the organic material of the mulch will slowly decompose and provide nutrients to the soil. The decomposing part of the organic mulch will increase aggregation and soil structure through the production of organic compounds (e.g. humic acids). The reduced necessity for ploughing of the Almond fields will result in less fuel use and labour as well as reduced emission of CO2. In addition, the mulch cover prevents weeds to grow and so less competition from weeds will occur and less herbicides are needed.

Establishment / maintenance activities and inputs: The establishment of mulching depends on the material used for mulching. Given its availability, the easiest is the use of pruning residue from Almond trees. Almonds are pruned in autumn, and residue can be chopped and applied directly or stored in the field until early spring. Residues are chopped and spread around the tree stem and if enough material is available between tree stems. Alternatively, and depending on availability, pruning residue of pine trees or alpha-grass can be used. Pine tree residue should come from nearby forest stands and need to be chopped just like the almond pruning residue in spring. Litter from the forest floor should not be used as this will cause damage to the forest. Alpha-grass is very common in the region and should be harvested in winter in the fields surrounding the cultivated area without destroying the plant allowing it to regenerate. The alpha-grass does not need to be chopped and can be put around the tree stem of the almond trees.

Natural / human environment: The technology is feasible for soils of shallow to medium depth (between 20-60 cm), and with gentle to moderate slope gradients (2 - 8%). The climate is semi-arid with a mean annual rainfall around 300 mm. Droughts, centred in summer commonly last for more than 4-5 months. Annual potential evapotranspiration rates larger than 1000 mm are common. The production system is highly mechanised and market oriented but depends strongly on agricultural subsidies. All cropland is privately owned.

2.3 Photos of the Technology

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

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:

• during experiments/ research

Comments (type of project, etc.):

Mulching is a well-known technique. However, until now not widely applied under semi-arid conditions without irrigation. With irrigation, plastic mulch is widely applied.

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

Comments:

Major land use problems (compiler’s opinion): A lack of water availability seriously limits the production potential of the soil and results in a low vegetation/crop cover. The relatively high soil erosion rates cause various off-site related problems (i.e. flooding, reservoir siltation) and on-site problems (i.e. gully formation and loss of soil depth).

Major land use problems (land users’ perception): Lack of water for irrigation of crops limiting the crop types that can be planted as well as the crop yield of dryland farming.

Livestock is grazing on crop residues

3.3 Further information about land use

other (e.g. post-flooding):

• all three

Comments:

Water supply: rainfed, mixed rainfed - irrigated

Number of growing seasons per year:

• 1

Specify:

Longest growing period in days: 220Longest growing period from month to month: November to June

3.5 Spread of the Technology

Specify the spread of the Technology:

• evenly spread over an area

If the Technology is evenly spread over an area, indicate approximate area covered:

• < 0.1 km2 (10 ha)

Comments:

No examples are known of organic mulching that are applied in the area.

3.6 SLM measures comprising the Technology

Comments:

Main measures: agronomic measures

Type of agronomic measures: mulching

3.7 Main types of land degradation addressed by the Technology

Comments:

Main type of degradation addressed: Wt: loss of topsoil / surface erosion, Pk: sealing and crusting, Ha: aridification

Secondary types of degradation addressed: Wo: offsite degradation effects

Main causes of degradation: crop management (annual, perennial, tree/shrub) (Almond fields often have a very low surface cover by vegetation during long periods of the year, due to frequent ploughing, leaving the soil unprotected against raindrop impact and rill or gully forma), disturbance of water cycle (infiltration / runoff) (Reduced infiltration capacity causing runoff and soil erosion), poverty / wealth (Alternative and more profitable labour sources are a permanent risk of land abandonment that can lead to degradation.)

Secondary causes of degradation: Heavy / extreme rainfall (intensity/amounts) (High intensity erosive rainfall is common), droughts (Dry periods and dry years require higher water availability)

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

Comments:

Main goals: prevention of land degradation, mitigation / reduction of land degradation

4.1 Technical drawing of the Technology

4.2 Technical specifications/ explanations of technical drawing

Photo of how the mulch should be divided under the tree stems. If enough material is available, a continuous cover without bare surfaces between trees is recommended.

Technical knowledge required for field staff / advisors: moderate (Knowledge on the type of material used for mulch is essential)

Technical knowledge required for land users: low (The application in the field is simple)

Main technical functions: control of raindrop splash, control of dispersed runoff: retain / trap, control of dispersed runoff: impede / retard, control of concentrated runoff: retain / trap, control of concentrated runoff: impede / retard, improvement of ground cover, increase / maintain water stored in soil

Secondary technical functions: increase of surface roughness, improvement of surface structure (crusting, sealing), increase in organic matter

Mulching
Material/ species: organic material (almond pruning, pine chips, alpha-grass)
Quantity/ density: max 3-5 cm

4.4 Establishment activities

	Activity	Type of measure	Timing
1.	Purchase of per (to cut pruning residue)	Agronomic

4.5 Costs and inputs needed for establishment

	Specify input	Unit	Quantity	Costs per Unit	Total costs per input	% of costs borne by land users
Equipment	Per (to cut pruning residue)	piece	1.0	4761.0	4761.0	100.0
Total costs for establishment of the Technology					4761.0

Comments:

Duration of establishment phase: 12 month(s)
Life span of the per: 10 years. Number of parties sharing: 2

4.6 Maintenance/ recurrent activities

	Activity	Type of measure	Timing/ frequency
1.	Cut alpha-grass (optional)	Agronomic	winter
2.	apply mulch of alpha-grass, almond and pine tree pruning residue	Agronomic	early spring or autumn after almond pruning

4.7 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	Cut alpha-grass (optional)	person/days	4.0	95.25	381.0	100.0
Labour	apply mulch of alpha-grass, almond and pine tree pruning residue	person/days	4.0	10.0	40.0	100.0
Equipment	Machine use	person/days	0.5	88.0	44.0	100.0
Fertilizers and biocides	Mulch	tons/ha	15.0	55.53333	833.0	100.0
Total costs for maintenance of the Technology					1298.0

Comments:

Machinery/ tools: Tractor and chopper to chop the almond pruning residue.

The original price of the chopper is estimated at $4761. In calculations it is assumed that the chopper is shared between at least two farmers, and with an average farm size of 10 ha, which gives a price of $238/ha establishment costs. Calculations include the cutting of alpha-grass to apply this as mulch in addition to the chopped almond and pine tree residue. Excluding the alpha-grass as a mulch reduces the total maintenance cost to 650. Leaving out also the chopped pine tree residue and using only the chopped almond pruning residue reduces maintenance costs to $44. The costs were indicated assuming a distance of 7 meter between almond trees and a mulch cover around each tree of 3*3 meters. Prices are for spring 2008.

4.8 Most important factors affecting the costs

Describe the most determinate factors affecting the costs:

Labour for cutting alpha grass, and the price of the mulch are most determining factors of the costs. Almond prunings are free of charge (except for costs to chop them), but will not provide enough mulch. Chopped Pine pruning or straw mulch are relatively expensive.

5.1 Climate

5.2 Topography

5.3 Soils

5.4 Water availability and quality

5.5 Biodiversity

5.6 Characteristics of land users applying the Technology

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: Traditionally most agriculture is done by men in this region.

Population density: 10-50 persons/km2

Annual population growth: < 0.5%

15% of the land users are rich and own 20% of the land.
80% of the land users are average wealthy and own 75% of the land.
5% of the land users are poor and own 5% of the land.

Off-farm income specification: There is no difference in the ones who apply the technology and those who don’t. Most farmers do have an off-farm income for example from hunting, work in a factory, or office.

5.7 Average area of land owned or leased by land users applying the Technology

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

Land ownership:

• state
• individual, titled

Land use rights:

• communal (organized)
• individual

Water use rights:

• communal (organized)
• individual

Comments:

Most land is privately owned. Some shrubland or forest is state property. Water use is organised by permits to water extraction from aquifers on individual basis. Water rights are provided and controlled by the Water authority of the Segura river basin (CHS).

5.9 Access to services and infrastructure

6.1 On-site impacts the Technology has shown

Socio-economic impacts

Production

Water availability and quality

Income and costs

Socio-cultural impacts

Ecological impacts

Water cycle/ runoff

Soil

Biodiversity: vegetation, animals

Climate and disaster risk reduction

6.2 Off-site impacts the Technology has shown

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	Type of climatic change/ extreme	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 rainstorm	well
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 well

Other climate-related consequences

Other climate-related consequences

	How does the Technology cope with it?
reduced growing period	well

6.4 Cost-benefit analysis

How do the benefits compare with the establishment costs (from land users’ perspective)?

How do the benefits compare with the maintenance/ recurrent costs (from land users' perspective)?

Comments:

Mulch is relatively expensive and so implies an additional cost.

6.5 Adoption of the Technology

Comments:

There is no trend towards spontaneous adoption of the Technology

Comments on adoption trend: There is not so much awareness, and most farmers are afraid of possible costs of mulching and don’t count on increased crop yield.

6.7 Strengths/ advantages/ opportunities of the Technology

Strengths/ advantages/ opportunities in the land user’s view
A good surface cover throughout the year provides good protection against erosion and helps reducing number of tillage operations and expenses How can they be sustained / enhanced? no suggestions

Strengths/ advantages/ opportunities in the compiler’s or other key resource person’s view
The main advantage is that a good surface cover is obtained below almonds that traditionally are characterised by a very poor surface cover during the whole year. The mulch will reduce evaporation and prevent erosion to take place. How can they be sustained / enhanced? Cheapest type of mulch should be identified (alpha grass, chopped pruning residues, …).

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?
The price of the mulch	Look for alternative low cost materials

Weaknesses/ disadvantages/ risks in the compiler’s or other key resource person’s view	How can they be overcome?
The price of the mulch and/or the price of carrying it to the field	Look for alternative low cost materials, the nearest to the plots as possible.
Once the mulch in situ, any tillage operation would incorporate it to the soil, reducing part of its initial benefit; if the mulch is green (alpha grass) it would depress soil N levels upon decomposition, though it would increase SOM in the medium-long term	Avoid tillage in mulched areas

7.2 References to available publications

Title, author, year, ISBN:

Smets, T., Poesen, J. and Knapen, A., 2008. Spatial scale effects on the effectiveness of organic mulches in reducing soil erosion by water. Earth-Science Reviews, 89(1-2): 1-12.

Available from where? Costs?

Internet

Title, author, year, ISBN:

Verdu and Mas 2007. Mulching as an alternative technique for weed management in mandarin orchard tree rows. AGRONOMY FOR SUSTAINABLE DEVELOPMENT. 27(4): 367-375

Available from where? Costs?

Internet

Title, author, year, ISBN:

http://www.isahispana.com/

Available from where? Costs?

Internet

Title, author, year, ISBN:

Mellouli, H.J., van Wesemael, B., Poesen, J. and Hartmann, R., 2000. Evaporation losses from bare soils as influenced by cultivation techniques in semi-arid regions. Agricultural Water Management, 42(3): 355-369.

Available from where? Costs?

Internet