Use of green manure in rice farming systems in West and Northwest Cameroon
1988
Roy, A.C. | Wanki, S.B.C. | Takow, J.A.
In Africa, few attempts have been made to improve rice soil fertility using organic manure. With less intensive cropping patterns, most African rice fields are kept as grass fallow or bush fallow the season before the rice crop. Soil fertility would be improved if some adaptable legumes were grown as green manure crops during the off-season. In recent studies on the suitability of some legume species as green manure crops in upland and irrigated rice-based cropping systems at Mbo and Ndop Plains, Cameroon, Crotalaria caricia from Zaire was the fastest growing. Sesbania and Crotalaria can be used for irrigated transplanted rice. A local species of Azolla seems to grow well with about 40-60 kg phosphate fertilizer. In upland rice at Mbo Plain, Crotalaria with moderate levels of applied N increased rice yields. In irrigated rice, yield increases were even higher. Corresponding yield increases at Ndop Plain were less.
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