氮肥、钾肥不同用量和施用时期配比对玉米产量的影响

为探索玉米在我省中高海拨种植最适宜的施肥量及运筹策略。采用正交试验设计,研究氮肥、钾肥不同用量和施用时期配比对玉米产量的影响。结果表明:各因素效应从大到小依次是氯化钾用量、尿素用量、尿素施用时期和氯化钾施用时期;前两个因素差异均达极显著水平,后两个因素差异不明显。最佳处理组合为氯化钾用量15 kg/667m~2、尿素用量40 kg/667m~2、N素不施拨节肥重施穗肥、钾肥三个时期各占1/3。

Effect of Fertilization Amount and Application Time of Nitrogen and Potash Fertilizer on Yield of Corn

In order to investigate suitable fertilizer amount and strategy for medium altitude and high altitude areas in Guizhou province,orthogonal experiment design was adopted to study the yield of maize by applying different amount of nitrogen fertilizer and potassium fertilizer.The results showed that the effect of each factor in sequence was fertilization amount of potassium chloride,fertilization amount of urea,application time of urea and application time of potassium chloride.Difference between the first two factors was very significant,while the difference between the last two factors was not significant.The best treatment was to apply potassium chloride for 15 kg/667m2 and urea for 40 kg/667m2,while applying nitrogen fertilizer at heading period and applying potash fertilizer equally at the three periods.