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Chinese Journal of Applied Ecology ›› 2000, Vol. ›› Issue (4): 535-539.

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Coupling effect of water and fertilizers on spring wheat yield in semi-arid area of western Liaoning Province

LI Fayun1, SONG Li1, GUAN Chuyun2, GE Danzhi2, LIU Zuoxin3   

  1. 1. College of Environmental and Life Sciences, Liaoning University, Shenyang 110036;
    2. Hunan Agricultural University, Changsha 410128;
    3. Institute of Applied Ecology, Chinese A cademy of Sciences, Shenyang 110015
  • Received:1999-09-14 Revised:2000-03-13 Online:2000-07-25

Abstract: With optimum saturation design,a field experiment was conducted to study the coupling effect of water and fertilizers on spring wheat yield in semiarid area of western Liaoning Province.Regression model shows that water was the most important factor affecting spring wheat yield.Under natural raining and when the upper and the lower limit of irrigation was 360 mm and 45mm,respectively,N was the most sensitive factor,water was the second, and P was the third. The effects of N,P and water on yield were statistically significant,and met the law of diminishing return.The most economic matching pattern of N,P and water was N 186kg穐m-2,P 63kg穐m-2,and water 300mm.Properly increasing phosphorus fertilizer at the lack of water could strengthen the drought resistance of spring wheat.