不同肥料组合对冬小麦水分供需状况的研究

采用Ｄ－饱和最优设计对半湿润易旱区冬小麦在各生育阶段土壤水分平衡状况以及不同肥料组合对冬小麦产量和水分利用效率的影响进行了分析和研究。结果表明，根据水量平衡法计算不同施肥条件下土壤供水量明显不同，以Ｎ、Ｐ、有机肥组合土壤供水占的比例最大为２７％，单施氮肥利用降水补给占的比例最高为１００％。整个生育期，单施氮肥冬小麦水分亏缺最严重，而磷肥与有机肥组合水分亏缺最小，Ｎ、Ｐ、有机肥组合能显著提高冬小麦产

Effect of different fertilizer combinations on water supply-demand status of winter wheat

The soil water status during various growing stages of winter wheat and the effect of different fertilizer combinations on its yield and water use efficiency (WUE) were studied in a semihumid and slanting drought area by using the design of D optimun saturation.According to water balance law,soil water supply was obviously different with different fertilizer combinations,reaching a peak when N and P fertilizers were combined applied with organic fertilizer,accounting for 27% of total water consumption. N fertilizer added alone took up 100% of total water consumption from rainfall.Water deficiency was most severe when N fertilizer was applied alone,but was the smallest when P fertilizer was applied with organic fertilizer.The combination of N,P and organic fertilizer could significantly improve winter wheat yield and its WUE.