【摘要】 应用"3414"田间试验方案研究不同氮磷钾配比对小麦产量的影响,建立丹阳地区小麦产量(Y)与氮(N)、磷(P)、钾(K)肥用量的肥料效应函数Y=141.84+18.16N-2.36N2+8.73P-1.93P2+9.81K-0.97K2+0.07NP+0.46NK+1.32PK,获得在丹阳地区粉沙土中等地力水平下小麦的最佳经济产量为5 152.1 kg/hm2,氮、磷、钾的最佳施用量为N 216.0 kg/hm2、P2O577.2 kg/hm2、K2O 122.6 kg/hm2。肥料效应方程表明,氮肥对小麦的增产增效最明显,其次是钾肥。氮、磷、钾肥料配合施用能促进小麦对氮、磷、钾的吸收。在氮肥处理中,N1水平(94.5 kg/hm2)的氮素利用率为34.5%~44.4%,高于N2水平(189.0 kg/hm2),N3水平(283.5 kg/hm2)最低,仅为29.2%;磷、钾肥利用率的变化趋势与氮肥类似。更多还原

【Abstract】 Field experiments were conducted to study effects of different combinations of nitrogen,phosphorus and potash fertilizers application on yields and nutrients use efficiency of wheat in Danyang city.Regression equations of wheat yield to the amous of nitrogen,phosphorus and potash applied were estimated,i.e.Y=141.84+18.16N-2.36N2+8.73P-1.93P2+9.81K-0.97 K2+0.07NP+0.46NK+1.32PK.The maximum wheat yield of 5 152.1 kg/hm2 calculated from the regression equation occurred when the application amounts of nitrogen,phosphorus and potash reached 216.0 kg/hm2,77.2 kg/hm2 and 122.6 kg/hm2 respectively.Nitrogen fertilizer had greatest effect on yield of wheat,followed by phosphorus and potash.Combined application of nitrogen,phosphorus and potash fertilizers could enhance the absorption of N,P,K of wheat markedly.The highest NUE were between 34.5% and 44.4% with application rate of N1 level,while the lowest NUE of 29.2% occurred with N3 level.Phosphorus and potash fertilizers utilization showed the similar trends.更多还原