Effects of N,P and K Amounts on Yield Traits of Wheat in Wheat-cotton Intercropping System

麦棉套作模式氮磷钾肥料用量对小麦产量性状的影响（英文）

[Objective] This study was conducted to investigate the demands for N, P and K by wheat in wheat cotton intercropping system in high-fertility field of Hebei Province. [Method] The experiment adopted randomized block arrangement. Five treatments （0, 75, 150, 225 and 300 kg/hm2） were designed for N, P and K. Wheat tillering, ear number, yield and yield components were investigated. [Result] Wheat yield increased significantly with the application of N fertilizer. The number of ears per unit area, number of grains per ear, 1 000-grain weight and yield were im- proved with N increasing. P fertilizer improved wheat yield at a certain degree, but K had no effect on wheat yield. ]Conclusion] The optimum fertilization for wheat-cot- ton intercropping system was N at 225-300 kg/hm2 and P2Os at 150 kg/hm2; and there is no need to apply K.

[目的]研究河北省南部高肥力地块在麦棉套作模式下的小麦氮磷钾肥料需求量,为合理施肥提供理论依据。[方法]采用大田随机区组试验,针对氮、磷、钾3种肥料分别设置了0,75,150,225,300 kg/hm^25个用量梯度,调查小麦分蘖、成穗数、产量及产量构成因素。[结果]氮肥对小麦具有显著的增产作用,单位面积穗数、穗粒数、千粒重及产量随施氮量增加而增加,磷肥具有一定的增产效果,钾肥无增产效果。[结论]在河北省南部高肥力地块,麦棉套作小麦适宜肥料用量为氮肥225~300 kg/hm^2,磷肥150 kg/hm^2,免施钾肥。