Evaluation of cowpea as legume component in acid upland rice-based cropping systems
1988
Torres, R.O. | Magbanua, R.D. | Garrity, D.P. (International Rice Research Inst., Los Banos, Laguna (Philippines). Multiple Cropping Dept.)
Soil fertility depletion in acid, infertile upland areas is exacerbated by cereal monocropping without fertilizer application. Diversification into cereal-legume sequences may have important nutrient cycling advantages towards more sustainable cropping systems, but few legumes have adequate acid soil tolerance. Cowpeas (Vigna unguiculata Walp) has excellent adaptation to acid soils. Its productivity and management requirements as a system component was studied in three experiments on upland soils of pH 4.6-5.0 in Northern Mindanao [Philippines]. Early duration (65d) cultivars were compatible intercrops with upland rice and increased gross income 4-11% with a mean land equivalent ratio (LER) of 1.37. Intercropped cowpeas was found not in direct competition with the upland rice crop. Liming increased cowpea yield in this environment but inoculant, P and N did not. Cultivar evaluation identified entries with high seed yields, and high storer yields for forage or green manure.
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