1.2 Detalhes do contato das pessoas capacitadas e instituições envolvidas na avaliação e documentação da tecnologia

Nome do projeto que facilitou a documentação/avaliação da Tecnologia (se relevante)

Projet de développement rural de Tahoua, Niger (PDRT)

1.3 Condições em relação ao uso da informação documentada através de WOCAT

Quando os dados foram compilados (no campo)?

01/08/1999

O/a compilador/a e a(s) pessoa(s) capacitada(s) aceitam as condições relativas ao uso de dados documentados através da WOCAT:

Sim

2.1 Descrição curta da tecnologia

Definição da tecnologia:

Rehabilitation of degraded land through manured planting pits, in combination with contour stone lines. The planting pits are used for millet and sorghum production on gentle slopes.

2.2 Descrição detalhada da tecnologia

Descrição:

The combination of planting pits (tassa) with stone lines is used for the rehabilitation of degraded, crusted land. This technology is mainly applied in semi-arid areas on sandy/loamy plains, often covered with a hard pan, and with slopes below 5%. These denuded plains are brought into crop cultivation by the combination of tassa and stone lines. Planting pits are holes of 20-30 cm diameter and 20-25 cm depth, spaced about 1 m apart in each direction. The excavated earth is formed into a small ridge downslope of the pit. Manure is added to each pit, but its availability is sometimes a problem. At the start of the rainy season, millet or sorghum is sown in these pits. The overall aim of the system is to capture and hold
rainfall and runoff, and thereby improve water infiltration, while increasing nutrient availability.
Stone lines are small structures, at most three stones wide and sometimes only one stone high. The distance between the lines is a function of the slope and availability of stone. Typically they are sited 25-50 m apart on 2-5% slopes. Stones are usually collected from nearby sites - though sometimes up to 5-10 km away and brought to the fields by donkey carts or lorries (when a project is involved). They are positioned manually, along the contour. Stone lines are intended to slow down runoff. They thereby increase the rate of infiltration, while simultaneously protecting the planting pits from sedimentation.
Often grass establishes between the stones, which helps increase infiltration further and accelerates the accumulation of fertile sediment. Wind-blown particles may also build up along the stone lines due to a local reduction in wind velocity. The accumulation of sediment along the stone lines in turn favours water infiltration on the upslope side. This then improves plant growth, which further enhances the effect of the system. Construction does not require heavy machinery (unless the stones need to be brought from afar by lorry).
The technique is therefore favourable to spontaneous adoption. Stone lines may need to be repaired annually, especially if heavy rains have occurred. Manure is placed every second (or third) year into the previously dug pits and sand is removed annually: normally the highest plant production is during the second year after manure application.

2.3 Fotos da tecnologia

2.5 País/região/locais onde a tecnologia foi aplicada e que estão cobertos nesta avaliação

2.7 Introdução da tecnologia

Especifique como a tecnologia foi introduzida:

• através de projetos/intervenções externas

3.1 Principal/principais finalidade(s) da tecnologia

• Reduz, previne, recupera a degradação do solo

3.2 Tipo(s) atualizado(s) de uso da terra onde a tecnologia foi aplicada

Comentários:

Major land use problems (compiler’s opinion): Soil fertility decline is the basic problem: this is due to degradation and nutrient mining. Loss of limited rainwater by runoff and loss of soil cover result in low crop production and food insufficiency. This occurs in combination with lack of pasture, resulting in shortage of manure.

3.3 Mais informações sobre o uso da terra

Abastecimento de água para a terra na qual a tecnologia é aplicada:

• Precipitação natural

3.4 Grupo de GST ao qual pertence a tecnologia

• Coleta de água
• Gestão de irrigação (inclusive abastecimento de água, drenagem)

3.5 Difusão da tecnologia

Especifique a difusão da tecnologia:

• Uniformemente difundida numa área

Comentários:

Total area covered by the SLM Technology is 40 km2.

3.6 Medidas de GST contendo a tecnologia

Comentários:

Specification of other agronomic measures: Manure application (supplementary)

Specification of other structural measures: stone lines, planting pits

Type of agronomic measures: manure / compost / residues

3.7 Principais tipos de degradação da terra abordados pela tecnologia

Comentários:

Main type of degradation addressed: Wt: loss of topsoil / surface erosion, Et: loss of topsoil, Cn: fertility decline and reduced organic matter content, Pc: compaction, Pk: sealing and crusting

3.8 Redução, prevenção ou recuperação da degradação do solo

Especifique o objetivo da tecnologia em relação a degradação da terra:

• Recuperar/reabilitar solo severamente degradado

4.1 Desenho técnico da tecnologia

4.2 Especificações técnicas/ explicações do desenho técnico

Planting pits (tassa) capture rainfall runoff for cultivation of annual crops, and the stone lines - spaced at 25-50 metres apart - help hold back moisture and eroded soil.

Technical knowledge required for field staff / advisors: moderate

Technical knowledge required for land users: low

Main technical functions: increase in organic matter, increase of infiltration, increase / maintain water stored in soil, water harvesting / increase water supply, increase in soil fertility, increases natural regeneration of trees

Secondary technical functions: reduction of slope length, improvement of ground cover, improvement of soil structure

Manure / compost / residues
Quantity/ density: 2.5 t/ha

Structural measure: stone lines
Spacing between structures (m): 25-50planting pits

Structural measure: planting pits
Vertical interval between structures (m): 1
Spacing between structures (m): 1
Depth of ditches/pits/dams (m): 0.2-0.25
Width of ditches/pits/dams (m): 0.2-0.3

Slope (which determines the spacing indicated above): <5%

4.3 Informação geral em relação ao cálculo de entradas e custos

Especifique a moeda utilizada para os cálculos de custo:

• Dólares norte-americanos

4.4 Atividades de implantação

	Atividade	Tipo de medida	Periodicidade
1.	Digging pits (tassa): the excavated earth	Estrutural	dry season (November to May)
2.	Digging out stones from nearby sites	Estrutural	dry season (November to May)
3.	Transporting stones	Estrutural	dry season (November to May)
4.	Aligning the stones along the contour with the help of a ‘water tube	Estrutural	dry season (November to May)

4.5 Custos e entradas necessárias para a implantação

	Especifique a entrada	Unidade	Quantidade	Custos por unidade	Custos totais por entrada	% dos custos arcados pelos usuários da terra
Mão-de-obra	Digging tassa	persons/day/ha	100,0	1,5	150,0	100,0
Mão-de-obra	Building stone lines	persons/day/ha	26,666	1,5	40,0	100,0
Equipamento	Tools for tassa	ha	1,0	5,0	5,0	100,0
Equipamento	Tools for stone lines	ha	1,0	5,0	5,0	75,0
Fertilizantes e biocidas	Compost/manure	ha	1,0	5,0	5,0	100,0
Outros	Transporting stones with lorri	ha	1,0	40,0	40,0
Custos totais para a implantação da tecnologia					245,0

Comentários:

Duration of establishment phase: 12 month(s)

4.6 Atividades recorrentes/manutenção

	Atividade	Tipo de medida	Periodicidade/frequência
1.	Manuring the pits with approx 250 g per pit	Agronômico	dry season (November to May) / initial establishment
2.	Manuring the pits with about 250 g per pit (2.5 t/ha)	Agronômico	October/November or March-May / every second year
3.	Removing sand from the tassa	Estrutural	March-May/annual
4.	Check and repair stone lines	Estrutural	annually and after heavy rains.

4.7 Custos e entradas necessárias pata a manutenção/atividades recorrentes (por ano)

	Especifique a entrada	Unidade	Quantidade	Custos por unidade	Custos totais por entrada	% dos custos arcados pelos usuários da terra
Mão-de-obra	Labour	persons/day/ha	21,0	1,5	31,5	100,0
Equipamento	Tools for tassa	ha	1,0	1,0	1,0	100,0
Fertilizantes e biocidas	Compost/manure	ha	1,0	2,5	2,5	100,0
Custos totais para a manutenção da tecnologia					35,0

Comentários:

Machinery/ tools: hoe, pick-axe, shovel, donkey cart, (lorries)

The costs are based on 300 m of stone lines per hectare (on a 3-4% slope). Maintenance costs refer to removing
sand from the pits from the second year onwards, and to the application of manure every second year (costs are spread on an annual basis). If applicable, costs for transporting the manure need to be added. The general assumption in these calculations is that adequate manure is readily available close by. The availability of stones is the main factor in determining costs - though labour availability can affect prices also. If stones are not available in the field or nearby (from where they can be transported by donkey cart), they have to be carried by lorries, which is much more expensive. The costs here refer to fuel costs only, paid by a project: they do not include depreciation of lorries.

5.1 Clima

5.2 Topografia

5.3 Solos

Caso disponível anexe a descrição completa do solo ou especifique as informações disponíveis, p. ex. tipo de solo, PH/acidez do solo, nitrogênio, capacidade de troca catiônica, salinidade, etc.

Soil depth on average: Also deep

Soil fertility is low - very low

Soil drainage / infiltration is good, though infiltration is low where there is a crust

5.6 Características dos usuários da terra que utilizam a tecnologia

Indique outras características relevantes dos usuários da terra:

Off-farm income specification: remittances from out-migration of labour, commerce and crafts

5.7 Média da área de terra própria ou arrendada por usuários da terra que utilizam a tecnologia

5.8 Propriedade de terra, direitos de uso da terra e de uso da água

Propriedade da terra:

• Indivíduo, intitulado

Direitos do uso da terra:

• Indivíduo

6.1 Impactos no local mostrados pela tecnologia

Impactos socioeconômicos

Produção

Renda e custos

Outros impactos socioeconômicos

Impactos socioculturais

Impactos ecológicos

Ciclo hídrico/escoamento

Solo

Outros impactos ecológicos

6.2 Impactos externos mostrados pela tecnologia

6.4 Análise do custo-benefício

Como os benefícios se comparam aos custos de implantação (do ponto de vista dos usuários da terra)?

Como os benefícios se comparam aos custos recorrentes/de manutenção(do ponto de vista dos usuários da terra)?

6.5 Adoção da tecnologia

Comentários:

There is a moderate trend towards spontaneous adoption of the Technology

Comments on adoption trend: There is moderate growing spontaneous adoption (for rehabilitation of the plains), but there are no estimates available regarding the extent.

6.7 Pontos fortes/vantagens/oportunidades da tecnologia

Pontos fortes/vantagens/oportunidades na visão do/a compilador/a ou de outra pessoa capacitada
Simple technology, individually applicable in the dry season, requiring only very little training/knowledge and no special equipment.
Making best use of manure, which is a limiting resource.
Increase in agricultural production.
Rehabilitation of degraded and denuded land: bringing back into production formerly uncultivated land; extension of farm land to the plateaus.

6.8 Pontos fracos, desvantagens/riscos da tecnologia e formas de superá-los

Pontos fracos/vantagens/riscos na visão do/a compilador/a ou de outra pessoa capacitada	Como eles podem ser superados?
Labour demanding technology for implementation and maintenance	Mechanisation of tasks: transportation of stones and manure. However, this would raise the cost.
Instability of planting pits in loose soil, increased erosion on steeper slopes and with heavier rains	Avoid loose sandy soils and steep slopes.
The effectiveness can be compromised if the various geo-morphological units (plateaus, slopes) are not treated simultaneously	Catchment area approach if downstream flooding is an issue.
Possibility of land use conflicts concerning rehabilitated land, in particular with pastoralists	Better coordination/consultation before implementing the technology in an area.
Implementation constraint: availability of manure and/or stones and transporting manure/stones to the plateaus and slopes	Subsidise transport means (or supply donkey carts) or/and apply stone lines only in areas where there are stones available close to the fields.

7.2 Referências às publicações disponíveis

Título, autor, ano, ISBN:

Bety A, Boubacar A, Frölich W, Garba A, Kriegl M, Mabrouk A, Noufou O, Thienel M and Wincker H: Gestion durable desressources naturelles. Leçons tirées du savoir des paysans de l’Adar. Ministère de l’agriculture et de l’élevage, Niamey, 142 pp.. 19

Título, autor, ano, ISBN:

Hassane A, Martin Pand Reij C:Water harvesting, land rehabilitation and household food security in Niger: IFAD’s Soil and Water Conservation Project in IllelaDistrict. IFAD, Rome, 51 pp.. 2000.

Título, autor, ano, ISBN:

Mabrouk A, Tielkes E and Kriegl M: Conservation des eaux et des sols: Leçons des connaissances traditionnelles de la région de Tahoua, Niger. In: Renard, G., Neef, A,. Becker, K. and Von Oppen, M. (eds). de la région de Tahoua, Niger. 1998.