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采用三因素五水平二次正交旋转组合设计方法 ,研究了在中上等地力棉田上 ,移栽密度52 50 0株 /hm2 条件下 ,春育夏栽棉花氮肥、磷肥、钾肥的配合施肥效应。根据试验结果 ,建立了以籽棉产量、皮棉产量和霜前皮棉产量及部分产量构成因素为目标的肥料效应函数模型 ,分析了配方施肥增产的原因。并在此基础上模拟选优 ,制订出了籽棉产量 390 0 kg/hm2 、皮棉产量 150 0 kg/hm2 、霜前皮棉 1380 kg/hm2 以上的氮、磷、钾施肥方案
The quadratic orthogonal rotation combined design method of three factors and five levels was used to study the fertilization effect of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer on cotton in spring and summer planting under the condition of transplanting density of 52 50 plants / hm2 . Based on the test results, a fertilizer effect function model with the objective of producing seed cotton yield, lint yield, pre-frost lint yield and some yield components was established, and the reason for the increase of yield was analyzed. Based on this, the fertilization plan of nitrogen, phosphorus and potassium with the seed cotton yield 390 0 kg / hm2, the lint yield 150 0 kg / hm2 and the lube before frost 1380 kg / hm2 was formulated