水氮耦合对冬小麦不同生育期干物质积累量及水分利用效率的影响

摘要

Under field condition,using local main winter wheat cultivar Weimai 8 as material,the effects of water-nitrogen coupling on the dry matter accumulation and water use efficiency (WUE) of winter wheat at different growth stages were studied by completely random design.The results showed that irrigation and fertilization at turning green to jointing stage could increase the dry matter accumulation and WUE of winter wheat; irrigation at jointing to flowering stage had little effect on dry matter accumulation and WUE decreased with the increase of irrigation quantity; the dry matter accumulation was the maximum treated with high water and nitrogen (W2N2) at flowering to filling stage,while WUE were higher at lower water level.Taken together,medium water and high nitrogen (W1 N2) was the optimal treatment for improving the dry matter accumulation and WUE of winter wheat at growth period.%采用完全随机区组设计,利用当地主栽品种潍麦8号通过大田小区试验,研究水氮耦合对冬小麦不同生育期干物质积累量及水分利用效率的影响.结果表明,在返青-拔节期,灌水、施肥可提高冬小麦的干物质量及水分利用效率；拔节-扬花期,灌水对干物质积累影响不大,在高水处理下反而降低,从而水分利用效率降低；扬花-灌浆期,高水高氮(W2N2)处理的干物质量最大,而作物水分利利用效率(WUE)在低水水平下较高.综合来看,本试验条件下,中水高氮处理(W1N2)是提高冬小麦生育期干物质量和水分利用效率的最佳方案.