玉米氮磷钾不同配施水平的肥料效应

摘要

The effects of different application levels of nitrogen, phosphorus and potassium on maize yield and economic benefits were studied by 3414 field trial to provide a scientific basis for soil testing and formulated fertilization of maize in Wuchuan County. The results showed that rational application of NPK could significantly enhance maize yield and output. The order of maize yield was K shortage block >P shortage block>N shortage block>CK, yield-increasing effect was N>P>K> and interaction effect was NP>PK>NK. The fertilizer utilization rate decreased with increasing fertilizer amount. The theoretical maize yield could be up to 615. 23 kg/667m2 with the optimum fertilizing amount of N(18. 84 kg/667m2), P2O5 (12. 81 kg/667m2) and K2O (15. 31 kg/667m2).%为务川县玉米测土配方施肥提供科学依据,采用3414田间肥效试验方法,研究了氮、磷、钾肥不同配施水平对玉米产量及经济效益的影响.结果表明:合理施用氮、磷、钾肥具有显著的增产增收效果,缺钾区产量＞缺磷区产量＞缺氮区产量＞空白区产量,氮肥增产效应＞磷肥增产效应＞钾肥增产效应,氮磷肥互作效应＞磷钾肥互作效应＞氮钾肥互作效应,肥料利用率随施肥量的增加而减少;氮(N)、磷(P2O5)、钾(K2O)的最佳施肥量分别为18.84 kg/667m2、12.81 kg/667m2和15.31 kg/667m2,可获得理论产量615.23kg/667m2.