黄壤旱地玉米氮、磷、钾肥料利用率及其肥效

根据贵州黄壤肥力与肥料效益长期监测的部分试验结果.分析探讨了贵州黄壤旱地玉米氮、磷、钾肥料利用率及肥料效益.结果表明,黄壤旱地玉米氮肥利用率平均为40.6%.氮、磷、钾肥配合施用比单施氮肥其肥料利用率提高6%;磷肥利用率平均为9.3%,在施用氮肥的基础上增施钾肥对提高磷肥利用率效果不大;钾肥利用率很低,平均仅为4.9%,施用钾肥的效果不明显.黄壤旱地玉米1 kg纯氮的增产量平均为16.0kg,氮、磷、钾肥配合施用比单施氮肥增产2.4 kg,平均提高16.22%;1 kg纯P的增产量平均为17.5 kg;1 kg纯K的增产量平均为2.8kg.黄壤旱地玉米施肥建议以氮、磷肥为主,钾肥应少施或不施.

The Utilization Rate and Effect of N,P and K Fertilizers of Maize Planted On Yellow Upland Fields

The long-term monitoring results of the fertility of yellow upland soil and fertilizer effect showed that the average N utilization rate of maize planted on the yellow upland field was 40.6% and its utilization rate under application of N,P and K fertilizers was 6% higher than that under single N fertilizer,the average P utilization rate was 9.3% and its utilization rate under raising K fertilizer based on N application was not improved,and the average utilization rate of K fertilizer was 4.9%.The average increase maize yield of 1 kg pure N fertilizer was 16.0 kg and the yield under application of N,P and K fertilizer was 2.4 kg higher than that under single N fertilizer.The average increase maize yield of 1 kg pure P and K fertilizer was 17.5 kg and 2.8 kg respectively.The application suggestion for maize planted on yellow upland fields is to apply N and P fertilizer.