宁夏平罗春小麦氮、磷、钾肥肥效及适宜用量

用“3414”实验方案研究宁夏平罗县春小麦施用氮、磷、钾肥料的效果和最佳用量．结果表明，与未施肥处理相比．不同施肥处理均显著提高了春小麦籽粒产量；氮、磷、钾肥对春小麦的增产率，氮肥显著高于磷、钾肥，而磷肥又高于钾肥．根据肥料效应方程，确定春小麦最高产量（5231．5kg／hm。）时的氮、磷、钾肥的最佳施肥量分别是258kg／hm^2（N），173kg／hm^2（P2O3），22kg／hm^2（K2O）；经济最佳产量（5220．7kg／hm。）时的施肥量是257·9kg／hm^2（N），173．0kg／hm^2（P205），21．6kg／hm^2（K20），氮、磷、钾肥的施肥质量比为1：0．67：0．08．对于指导该地区农业的合理施肥具有重要的参考价值．

Spring Wheat N-P-K Fertilizer Efficiency and the Appropriate Amount for Pingluo in Ningxia

The appropriate amount and efficiency of the N, P, K fertilizer for spring wheat of Pingluo in Ningxia were investigated by field emperiments designed with ＂3414＂ plan. Experiment results showed that grain yield of spring wheat significantly increased with fertilization treatments compared with unfertilized treatments. Yield of spring wheat was the highest by using N fertilizer, followed by P and K fertilizer in this sequence. Based on the fertilizer response equation, the highest spring wheat production was 5 231.5 kg/hm2 when the optimum amount of nitrogen, phosphorus and potash fertilizer was N-258 kg/hm2, P2O5· 173 kg/hm2 and K2O-22 kg/hmz respectively, the economic optimum yield reached 5 220.7 kg/hm2 with amount of N-257. 9 kg/hm2, P2O5-173.0 kg/hm2 and K2O-21. 6 kg/hm2, and the mass ratio of N, P2O5 and K2O is 1 ： 0. 67 ： 0.08. This work is valuable for rational fertilization in the agriculture region.