较长期低温逆境下氮钾肥与播种量对小麦产量效应的研究

采用＂3414＂试验设计,研究了较长期低温条件下氮、钾肥和播种量对小麦产量的影响效应。结果表明：在较长期低温逆境下,N、K2O的肥料效应曲线均呈报酬递减型函数关系,N、K2O、小麦播种量三因素之间对产量均呈正交互作用,即高肥力（或高施肥量）条件下,宜提高小麦播种量,反之减少播种量;在较长期低温逆境条件下,小麦产量水平较往年降低,但氮、钾肥用量较往年明显提高,这可能与低温条件下,肥料利用率降低有关。

Effects of Nitrogen and Potassium Fertilizers and Seed Quantity on Yield of Wheat Encountered Long-term Low Temperature

Adopting the "3414" orthogonal experimental design,the effects of nitrogen,potassium and seed quantity on yield of winter wheat encountered long-term low temperature were studied.The results showed that the effects of N and K2O on the wheat yield showed diminishing returns functional relation.The interactions of nitrogen,potassium and seed quantity were positive to wheat yield,in other words,the seed quantity should be increased under high fertilizer,while decreased under low fertilizer.The wheat yield was reduced by long-term low temperature,but the application rate of nitrogen and potassium increased obviously compared to the past years,which might be caused by lower fertilizer use rate under low temperature.