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Chinese Journal of Applied Ecology ›› 2000, Vol. ›› Issue (5): 713-717.

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

CAO Jing1, HU Hengjue2   

  1. 1. State Key Laboratory of Arid Agroecology, Lanzhou University, Lanzhou 730000;
    2. Gansu Agricultural University, Lanzhou 730070
  • Received:1999-11-08 Revised:2000-02-09 Online:2000-09-25

Abstract: 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.