[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-optimum 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.