【摘要】 研究了不同施肥量 (N、P配施 )下黄绵土坡耕地大豆的水肥产量效应 .结果表明 ,水分利用效率(WUE)与作物产量 (Y)正相关 ,Y =0 .0 0 17+0 .0 0 3 5WUE .单施磷时 ,作物产量和WUE随磷的增加而增大 ;单施氮时 ,作物产量和WUE随氮的增加先增大后降低 ,表明施用氮应该配合施用一定量的磷 .施肥能显著提高作物产量和WUE ,与不施肥相比 ,施肥时作物产量和WUE分别提高了 86.76%～ 470 .16%和69.64 %～ 43 8.47% .与单施氮、磷相比 ,氮、磷合理配施能提高作物产量和水分利用效率 ,适宜的N、P(P2 O5)配施比例为 1.3∶1更多还原

【Abstract】 Studies on the effect of soil water and fertilizer on soybean yield on loess slope farmland showed that soybean yield ( Y ) increased linearly with the increase of water use efficiency (WUE).Soybean yield and WUE increase with the increase of P fertilizer when P fertilizer was applied alone,but increased firstly and then decreased with the increase of N fertilizer when N fertilizer was applied alone. Therefore, N fertilizer should be applied with P fertilizer. Compared to no fertilizer, fertilizer could significantly increase soybean yield and WUE by 86.76%～470.16% and 69.64%～438.47%, respectively. A combined application of N and P fertilizers could increase more soybean yield and WUE than applied each of them alone, and the rational ratio of N and P (P 2O 5) was 1.3 ∶1.更多还原