Effects of mineral nutrition on growth and yield of sweet potato (Ipomoea batatas) in Shambat area [Sudan].
1993
Ali A.M. | Bushra M.E.
Two experiments were carried out at the research farm of the Faculty of Agriculture at Shambat during the growing seasons 1984/85 and 1985/86 to study the effects of mineral nutrition on growth and yield of sweet potato. Fertilization rates were 110kg urea/ha (N), 90kg of superphosphate/ha (P), 160kg potassium suphate/ha (K), 10 tons chicken manure/ha (CM), the combinations N+P (NP), N+K (NK), N+P+K (NPK) and the control. Fresh vine weight per plant was significantly affected by fertilization in the second season. The range of increase over the control in response to single fertilizers in the two seasons was 112-313 for K, 59-229 for N, 52-196 for CM and 1-220 for P. In the second season, increase over the control resulting from fertilize combinations was 233 for NP, 153 for NK and 107 for NPK. Total yield and root weight per plant (but not dry matter content of roots) were significantly increased by single fertilizers and their combinations. The range of percent increase in yield over the control in the two seasons was 43-200, 20-210, 4-66 and 34-46 for K, N, P and CM, respectively. Fertilizer combinations in the second season increased the yield by 302, 276 and 202 for NK, NP and NPK, respectively. Such increase, however, was not significantly different from that of single fertilizers except for NK. Results of the present study showed the positive response of sweet potato to the nitrogen and potassium fertilizers and their combinations. However, further investigation is needed to determine fertilization recommendations in the clay loamy soils.
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