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在高肥水地块，选择大穗型品种，采用三因子二次通用旋转回归设计方法，研究了大穗型小麦产量６００ｋｇ／６６６７ｍ２氮磷钾最佳用量、配比及其对产量构成的影响。试验结果表明，三者对产量的影响顺序是磷肥＞氮肥＞钾肥；每６６６７ｍ２最佳用量为Ｎ１７７５～１８７７ｋｇ、Ｐ２Ｏ５９２６～１１１０ｋｇ、Ｋ２Ｏ１４１４～１４４７ｋｇ，ＮＰＫ之比为１∶０５６∶０７８；施肥量对产量构成三因素的影响顺序是穗粒数＞千粒重＞穗数；明确了产量构成三因素中的主攻因素。
In high-fertility plots, large-spike varieties were selected, and the three-factor quadratic universal rotation regression method was used to study the optimum amount of NPK and yield of 600kg / 6667m2 large-spike wheat and their effects on yield influences. The results showed that the order of the three effects on the yield was phosphate fertilizer> nitrogen fertilizer> potassium fertilizer; the best dosage for every 666.7m2 was N1775 ~ 1877kg, P2O5926 ~ 1110kg, K2O1414 ~ 1447kg, NPK ratio of 1:0 56:0 78; the order of the impact of the amount of fertilizer on the yield of the three factors are the number of grains per spike> 1000-grain weight> number of spikes; the main factors that determine the three factors of yield formation are clear.