云南玉溪紫色甘薯测土配方施肥效益研究初报
Journal of Southwest University(Natural Science Edition)（2012）
Abstract
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.
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Key words
formula fertilization,purple sweet potato,mathematical model,3414 test
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