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Закрити книгу / close this bookAbstracts on Sustainable Agriculture (GTZ; 1992; 423 pages)
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts On Traditional Land-Use Systems
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on farming systems research and development
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on integrated systems
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on cropping system
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on agroecology
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on agrometeorology
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on agroforestry
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on homegardens
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on seed production
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on plant protection
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on water management
Закрити папку / close this folderAbstracts on soil fertility
Перегляд документу / View the documentAcknowledgements
Перегляд документу / View the document1. Soil constraints on sustainable plant production in the tropics.
Перегляд документу / View the document2. Impact of agricultural practices on soil pollution.
Перегляд документу / View the document3. The use of organic biostimulants to help low input sustainable agriculture.
Перегляд документу / View the document4. Nitrogen cycling in high-input versus reduced-input arable farming.
Перегляд документу / View the document5. Green manure in rice farming.
Перегляд документу / View the document6. Role of green manure in low-input farming in the humid tropics.
Перегляд документу / View the document7. Green manuring with vetch on acid soil in the highland region of Rwanda.
Перегляд документу / View the document8. Tropical lowland rice response to preceding crops, organic manures and nitrogen fertilizer.
Перегляд документу / View the document9. Pearl millet and cowpea yields in sole and intercrop systems, and their after-effects on soil and crop productivity.
Перегляд документу / View the document10. Influence of some characteristics of bean seed and seedlings on the tolerance to low phosphorus availability in the soil. (Infuencia de algunas caracteristicas de las semillas y plantulas de frijol Phaseolus vulgaris L. sobre la tolerancia a la baja disponibilidad de fósforo en el suelo )
Перегляд документу / View the document11. Evaluation of diverse effects of phosphate application on legumes of arid areas.
Перегляд документу / View the document12. Effect of n and p fertilizers on sustainability of pigeonpea and sorghum systems in sole and intercropping.
Перегляд документу / View the document13. Efficient fertilizer use in acid upland soils of the humid tropics.
Перегляд документу / View the document14. Vesicular-arbuscular mycorrhiza management.
Перегляд документу / View the document15. Impact of tropical va mycorrhizae on growth promotion of cajanus cajan as influenced by p sources and p levels.
Перегляд документу / View the document16. Benefit and cost analysis and phosphorus efficiency of va mycorrhizal fungi colonizations with sorghum (sorghum bicolor) genotypes grown at varied phosphorus levels.
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on erosion and desertification control
Вiдкрити папку i переглянути змiст / Open this folder and view contentsAbstracts on potential crops for marginal lands
 

7. Green manuring with vetch on acid soil in the highland region of Rwanda.

Biol. Agric. and Hort., 7, 1991, pp. 303-310

The purpose of this study is to assess the value of vetch used as a green manure crop on acid soil prevalent in the highland region of Rwanda. Bean (Phaseolus vulgaris) and wheat (Triticum aestivum) yields and soil chemical analysis following incorporation of vetch were used to evaluate success in the improvement of soil fertility.

The study was carried out during four cropping seasons.

The soils are classified in the USDA system as Oxisols.

The advantages ascribed to legume green manuring are numerous and include: improvement in soil fertility, increased cation exchange capacity, increased water retention, enhanced microbial activity and improved soil structure.

Vetch (Vicia sativa L.) is a potential green manure crop in the East-Central African highland region where soils are generally acidic.

In this area, vetch grows relatively fast, assumes a quick soil cover to check ground erosion and produces high biomass.

Incorporation of 5-month old vetch lowered soil pH as well as raising exchangeable Al and H and reducing exchangeable Ca, Mg, and P.

Consequently, bean and wheat yields for the subsequent season were reduced by 71 and 33%, respectively. There was no response to fertilizer N on either main treatment. There were no significant yield differences for either crop with respect to vetch treatment during the second season. Third season crop yields were superior on the control plot, with that of beans being significantly different. Application of lime raised exchangeable Ca, K and reduced exchangeable Al. Bean was more affected by exchangeable Al than wheat. Half-life for decomposition of the vetch was 3.5 weeks and nutrient release pattern followed the order: K>N>P>Ca indicating that liming may be required to supply Ca and to neutralize soil acidity at the initial stages of decomposition.

Concluding, it can be stated that in the Rwandan highlands vetch grows rapidly and provides a quick cover to control erosion. Its use for green manuring on the acid soils in this region must be treated with caution.

Decomposing vetch material initially made the soil acidic and crops which immediately followed vetch incorporation suffered severe yield losses. It may be advisable to allow three to four weeks after incorporation before seeding food crops. Similarly, lime application may be necessary to counteract adverse effects of soil acidity during early stages of decomposition and also to supply Ca.

1244 92 - 12/70

Soil fertility

Asia, Philippines, humid tropics, lowland, field experiment, cropping systems, preceding crops, organic manure, nitrogen fertilizer, mungbean, sesbania, green manure, rice, maize, yield, residual effects

MEELU, O.P. et al.

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