黄土高原旱地小麦多年定位施用化肥的产量效应分析

以已进行18年的小麦长期肥料定位试验为背景，研究了长期施用化肥条件下小麦的增产效应及其对小麦吸收养分量的影响。结果表明：单施氮肥对小麦有增产作用，可以提高小麦籽粒的含氮量；18年施用氮肥平均增产1 080.5 kg/hm2，增产率达85.2%；单施磷肥无明显的增产作用，平均减产率为3.2%，但可提高小麦籽粒的含磷量；氮磷配施

Analysis of Long-term Fertilization Effect on Yield of Wheat in Dry-land on Loess Plateau

This experiment has been carried out for 18 years to study the effect of fertilization on wheat yield and nutrient absorption The single application of nitrogenous fertilizer can increase the wheat yield and the N content of wheat seeds The average yield increase was 1 080 5 kg/ha and the increase rate was 85 2% in 18 years The single application of phosphorus fertilizer had no obviously yield increase effect, and yield decrease rate was 3 2%, but the P content of seeds was increased The combined application of N with P had the significant yield increase effect and the increase rate was 140 6% The yield increase rate by combined K with N and P was not obviously, and the increase rate was 2 8%, but this application way should be applied in view of nutrient balance