Abstract
Experiments involving nitrogen, phosphorus and sulfur fertilizers were conducted for six years in two agroclimatic zones of Burkina Faso in collaboration with the International Fertilizer Development Center (IFDC). Results show that crop needs for N, P, and S depend on the plant characteristics, climatic and edaphic factors. In Saria, at the northern tip of the Sudan zone, application of 30 kgN/ha, 13.2 kg P/ha and 25 kg K/ha produced the highest yields of sorghum. At Farako-ba in the southern tip of the Sudan zone, the best NPK rates were 90, 26.4, and 50 kg/ha. Application of sulfur at the rate of 7.5 kg/ha also benefitted the maize crop. Point placement of nitrogen fertilizers enhanced the loss of N. Fifty percent (50%) partially acidulated phosphate rock was as efficient as commercial superphosphates. At Farako-ba plants responded to phosphate rock applied at the rate of 13.2 kg P/ha.
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