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通过对紫色甘薯采用氮磷钾肥料进行平衡施肥,利用3414试验方案进行田间试验,摸清云南玉溪紫色甘薯生产的N,P和K肥料施用效果,建立玉溪土壤的紫甘薯养分丰缺指标,并通过多元二次肥料效应函数寻求紫色甘薯最高产量和最佳经济施肥量.结果表明紫色甘薯施用N,P和K肥增产增效较为显著,其增产增收效果大小顺序为NPK,N,K和P,单位肥料效益大小顺序为P,N和K.玉溪紫色甘薯全市平均最高产量施肥量为N81.98,P2O552.92,K2O 187.04kg/hm2,最高产量为16 716.0kg/hm2;最佳经济施肥量N 78.42,P2O551.20,K2O 167.49kg/hm2,产量为16 594.5kg/hm2,其最佳利润为47 702.29元/hm2.
Through the balanced fertilization of purple sweet potato with NPK fertilizers, field experiments were conducted using the 3414 test plan to find out the effects of N, P and K fertilizers on purple sweet potato production in Yuxi, Yuxi, and to establish the index of nutrient deficiencies of purple sweet potato in Yuxi The highest yield of purple sweet potato and the best economic fertilizer amount were sought through the multiple secondary fertilizer effect function.The results showed that the yield and yield of N, P and K fertilizers of purple sweet potato were significant, and the order of increasing yield and increasing yield was NPK, N, K and P , And the order of unit benefit of fertilizer was P, N and K. The average yield of purple sweet potato in Yuxi City was N81.98, P2O552.92, K2O 187.04kg / hm2 and the highest yield was 16 716.0kg / hm2. The best economic fertilization The amount of N 78.42, P2O551.20, K2O 167.49kg / hm2, the yield of 16 594.5kg / hm2, the best profit of 47 702.29 yuan / hm2.