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。 Different fertilization treatments were designed in the northern black soil area to study the effects of different NPK fertilizers on water consumption and water use efficiency of soybean and their relationships. The results showed that fertilization could significantly increase the water use efficiency of soybean, and the water consumption and water use efficiency of soybean increased with the increase of nitrogen application when the demand of phosphorus and potassium for soybean was satisfied in different proportion of fertilizers. Nitrogen and potassium demand, with the increase of phosphorus, soybean water consumption, water use efficiency showed a parabolic change; and when the demand for nitrogen and phosphorus to meet the soybean, with the increase of potassium consumption, water consumption Showing a parabolic change. There was a significant positive correlation between water consumption and yield, while water use efficiency was significantly and positively correlated with yield.