黑土区不同施肥对大豆耗水量及水分利用效率的影响

Effect of Different Fertilizer Rates on Water Consumption and WUE of Soybean at Black Soil Region

在北部黑土区设计了不同的施肥处理,研究了氮磷钾不同配比对大豆耗水量和水分利用效率的影响及其相互关系。结果表明:施肥可显著提高大豆水分利用效率,在不同的肥料配比中,当满足大豆对磷钾的需求时,大豆的耗水量、水分利用效率随施氮量的增加而增加;当满足大豆对氮钾的需求时,随着施磷量的增加,大豆耗水量、水分利用效率则表现出抛物线型变化;而当满足大豆对氮磷的需求时,随着施钾量的增加,耗水量表现出抛物线型变化。耗水量与产量之间呈显著正相关关系,而水分利用效率则与产量呈极显著正相关关系。

An experiment with different NPK dosages was performed on the black soil aiming to study the effect on water consumption and water use efficiency （WUE） of soybean. The results showed that fertilizer application could significantly increase WUE of soybean. Of all the treatments adopted, when P and K fertilizers met needs, water consumption and WUE increased with the N fertilizer increasing. In contrast, when N and K fertilizers met needs the amount of P fertilizer showed a parabolic relationship with water consumption and WUE. And when N and P fertilizers met needs K fertilizer showed a parabolic relationship with water consumption. In addition, significantly positive correlations were observed between water consumption and yield of soybean, and between WUE and the yield.