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Residual nitrogen from legumes and its effect on the succeeding crop of sweet potato



Residual nitrogen from legumes and its effect on the succeeding crop of sweet potato



Annals of Tropical Research 2(2): 72-79



Three legumes (mung bean, bush bean and soybean) and sweet potato (control) were planted during the 1st cropping. After harvesting each crop, the residues except those of sweet potato were plowed under and incorporated into the soil. The final planting of sweet potato was done subsequently after the legume residues had been decomposed. There was a significant increase in the weight and length of vines of the 3 legumes. Weight and number of marketable tubers, weight of non-marketable tubers and total tuber yield greatly increased in plots previously planted to bush beans and soybeans while the said parameters had no effect on mung beans. Tuber yield and other agronomic characters were positively influenced by the different fertilizer levels. Fertilizer level of 0-30-60 kg/ha increased considerably the tuber yield of sweet potato planted after bush beans or soybeans. The best result was noted in the continuous sweet potato cropping treated with 60-60-60 kg/ha on both croppings. Alternate cropping of sweet potato with bush beans or soybeans gave greater output in addition to the improved physical conditions of the soil.

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Accession: 000969568

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