毛豆氮磷钾肥效应及推荐施肥量的研究

Studies on Respons and Recommended Application Rate of NPK Fertilizer for Green Soy Bean

通过田间试验研究毛豆施用氮磷钾肥料的效应,结果表明:N2P2K2处理毛豆的平均产量比不施肥处理增产17.9%,说明施肥对毛豆具有显著的增产作用。毛豆施用氮磷钾肥料平均分别增产16.0%、6.8%和6.1%,增产效果为N>P>K。氮磷钾肥的平均产投比分别为4.5、3.2和2.4;氮磷肥在中高肥力土壤的产投比较高,钾肥则在中低肥力土壤的产投比较高。平均推荐施用量为纯N 202 kg/hm2、P2O5 81 kg/hm2和K2O 100 kg/hm2,其预测产量为20 719 kg/hm2,三要素最佳比例为1∶0.40∶0.50。

It was studied on respons and recommended application rate of NPK fertilizer for green soy bean.The results showed that the average yield of green soy bean of N2P2K2 treatment increased by 17.9% compared with that of no fertilizer.It was indicated that fertilization increased the green soybean yield significantly.Green soy bean yield was increased on average by 16.0% 、6.8% and 6.1% respectively,with the application of N,P and K fertilizer.Thus,the effectiveness was N P K.Output and input ratio on N,P and K fertilizer was 4.5、3.2 and 2.4 respectively.N and P Fertilizer had a higher ratio of output and input than K fertilizers in middle and higher soil fertility,whereas K fertilizer had a higher ratio of output and input than N and P fertilizer in lower soil fertility.Recommended application rate of NPK fertilizer for green soy bean was found to be N 202 kg/hm 2、P2O5 81 kg/hm2 and K2O 100 kg/hm2 with the proportion 1∶0.40∶0.50,and the predicted output was 20 719 kg/hm2.