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close this bookAbstracts on Sustainable Agriculture (GTZ; 1992; 423 pages)
Open this folder and view contentsAbstracts On Traditional Land-Use Systems
Open this folder and view contentsAbstracts on farming systems research and development
Open this folder and view contentsAbstracts on integrated systems
Open this folder and view contentsAbstracts on cropping system
Open this folder and view contentsAbstracts on agroecology
Open this folder and view contentsAbstracts on agrometeorology
Open this folder and view contentsAbstracts on agroforestry
Open this folder and view contentsAbstracts on homegardens
Open this folder and view contentsAbstracts on seed production
Open this folder and view contentsAbstracts on plant protection
Open this folder and view contentsAbstracts on water management
close this folderAbstracts on soil fertility
View the documentAcknowledgements
View the document1. Soil constraints on sustainable plant production in the tropics.
View the document2. Impact of agricultural practices on soil pollution.
View the document3. The use of organic biostimulants to help low input sustainable agriculture.
View the document4. Nitrogen cycling in high-input versus reduced-input arable farming.
View the document5. Green manure in rice farming.
View the document6. Role of green manure in low-input farming in the humid tropics.
View the document7. Green manuring with vetch on acid soil in the highland region of Rwanda.
View the document8. Tropical lowland rice response to preceding crops, organic manures and nitrogen fertilizer.
View the document9. Pearl millet and cowpea yields in sole and intercrop systems, and their after-effects on soil and crop productivity.
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 )
View the document11. Evaluation of diverse effects of phosphate application on legumes of arid areas.
View the document12. Effect of n and p fertilizers on sustainability of pigeonpea and sorghum systems in sole and intercropping.
View the document13. Efficient fertilizer use in acid upland soils of the humid tropics.
View the document14. Vesicular-arbuscular mycorrhiza management.
View the document15. Impact of tropical va mycorrhizae on growth promotion of cajanus cajan as influenced by p sources and p levels.
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.
Open this folder and view contentsAbstracts on erosion and desertification control
Open this folder and view contentsAbstracts on potential crops for marginal lands

9. Pearl millet and cowpea yields in sole and intercrop systems, and their after-effects on soil and crop productivity.

Field Crops Res., 28, 1992, pp. 315-326

The objective of this study was to compare the productivity and effects on soil fertility by rotations of these common crops in Niger.

A 4-year field experiment was conducted in a Psammentic Paleustalf in Niger to determine the continuous cropping effects of pearl millet (Pennisetum glaucum (L) R.Br.), cowpea (Vigna unguiculata (L.) Walp.) and three pearl-millet/cowpea intercrop systems with cowpea planted 1, 2, and 8 weeks after millet planting on soil and crop productivity.

Crops were grown for grain on the same plots under rainfed conditions in 1986, 1987 and 1988 crop seasons and all crop residues were removed from experimental plots.

For three years preceding the experiment, millet was continuously planted in association with cowpea at low densities on these plots, similar to much of the dryland farm practices in Niger.

It can be concluded that millet/cowpea intercrop systems showed better land-use efficiency than sole millet or cowpea systems. On a total grain-yield basis, sole cowpea was more productive. Continuous cropping of sole cowpea with residue removal significantly increased soil Mg and OM over sole millet or millet/cowpea intercrops. Test-crop millet produced significantly higher dry-matter yield and N uptake in PCS sole cowpea than other treatments. Test-crop millet N uptake after previous intercrop treatments was significantly greater than previous sole millet. This leads us to believe that cowpea inclusion in sole or intercrop systems would make extra soil N available to following cereal crops such as millet. From a practical point of view, introduction of sole cowpea or cowpea-based intercrop systems in place of traditional millet-dominated intercrop systems may be advantageous.

Pearl millet (Pennisetum glaucum (L.) R.Br.) is planted principally for grain on about 10 million ha in West Africa. Generally in this region, millet is grown on infertile sandy soils in association with cereals such as sorghum and/or with legumes such as cowpea or groundnuts. Of all the combinations, the millet/cowpea association is the most widely used in the Sahelian zone of Niger, extending up to 50% of the country's cultivated area (about 2 million ha).

In recent years, farmers in Niger and other West African countries increased land area under millet cultivation to meet food needs by effectively decreasing the fallow period or replacing the traditional shifting cultivation with continuous cropping of millet-dominated intercrop systems.

As the application of fertilizers is not always economical in the semi-arid tropics of Niger, non-fertilizer-based methods to improve soil conditions, such as legume use, deserve special attention. In spite of a tremendous knowledge base in this area from Asian and Western countries, crop rotation on the impoverished soils of West Africa is not practiced.

This and other improper cultural practices are leading to a large-scale degradation of soils in this area.

1246 92 - 12/72

Soil fertility

Latin America, Colombia, field trial, phosphorus availability, bean seed tolerance, seedlings, mineral deficiences, roots, leaves, stems, starch, content, protein content, CIAT


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