ROOT CROPS-LEGUMES ROTATION AT VARYING FERTILIZER LEVELS

Abstract

Sweet potato yield was not significantly affected by fertilizer application even at the rate of 90-60-60 kg NPK/ha. Similar result was noted in cassava root yield. Fertilizer application in gabi at the rate of 0-60-60 kg NPK/ha resulted in 4.98 t of corms per hectare. This did not significantly differ from corm yield obtained at 30-60-60 and 90-60-60 kg NPK/ha.
Planting root crops in rotation with legumes even without applying inorganic fertilizers may be employed and reasonable yields can still be obtained. It appears that all the legume crops used were promising and can be used in rotation with the root crops to increase land productivity. However; mungbean, bushbean, and soybean produced the highest gross and net income when planted in rotation with gabi, cassava, and sweet potato, respectively, and contributed greatly to the total income.