施秉县玉米不同产量水平氮磷钾配方施肥的研究

目的]优化施秉县玉米氮、磷、钾肥配合施用,建立玉米施肥指标体系与施肥模式,提高化肥利用率,降低生产成本,提高玉米产量效益.方法]分别在施秉县旱作土中、低肥力水平进行了玉米“3414”肥效试验.结果]施秉县旱作土区中等肥力水平最佳施肥量N 198.6 kg/hm2,P2O5 146.7 kg/hm2,K2O 191.1 kg/hm2,最佳产量为7 755.6 kg/hm2;低等肥力水平最佳施肥量N 194.3 kg/hm2,P2O5125.4 kg/hm2,K2O 191.9 kg/hm2,最佳产量为7 432.5 kg/hm2.结论]加强对施秉县中、低肥力水平的旱作土实施测土配方施肥,能大幅度地提高玉米产量.

Formula Application of Nitrogen,Phosphorus and Potassium Fertilizer under Different Yield Level of Maize in Shibing County

Objective] The research aimed to optimize the cooridinate application of nitrogen,phosphorus and potassium fertilizer on maize in Shibing County,establish the indicator system of fertilization and fertilization mode,increase the fertilization ratio,reduce the production cost,and improve the maize yield and benefit.Method] Maize 3414 fertilizer efficiency trial was conducted in dry farming field with middle and low fertility level in Shibing County.Result] The optimum application amount in dry farming field with middle fertility level was nitrogen fertilizer 198.6 kg/hm2,phosphorus fertilizer 146.7 kg/hm2,and potassium fertilizer 191.1 kg/hm2.Under the condition,the optimum yield reached 7 755.6 kg/hm2.The optimum application amount in dry farming field with low fertility level was nitrogen fertilizer 194.3 kg/hm2,phosphorus fertilizer 125.4 kg/hm2,and potassium fertilizer 191.9 kg/hm2.Under the condition,the optimum yield reached 7 432.5 kg/hm2.Conclusion] Soil testing and formulated fertilization in dry farming field with middle and low fertility,Shibing County could improve the maize yield obviously.