PROGRESS IN GEOGRAPHY ›› 2004, Vol. 23 ›› Issue (1): 105-112.doi: 10.11820/dlkxjz.2004.01.012

• Original Articles • Previous Articles    

Effect of Water Stress on Dry-matter Partition and Yield Constitution of Winter Wheat

YU Li1, YU Qiang1, LUO Yi1, LIU Minghua2   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Department of Agronomy, Anhui Agricultural Uiversity, Hefei 230036, China
  • Received:2003-10-01 Revised:2004-01-01 Online:2004-01-24 Published:2004-01-24

Abstract:

Dry-matter accumulation, partition and yield of winter wheat by different irrigation or water stress in different development stages was analyzed. The proportion of stem was low and the proportion of spike was high under the fitting water condition, there were 24% of stem and 56% of spike. But on the condition of water stress, the proportion of stem became higher and the proportion of spike was lower. On condition of water shortage, the proportions of stem and spike were 36% and 43% respectively, and on the redundant water condition, the proportions were 37% and 48%. The contribution from stem to yield was 0.308 g/stem under the fitting water condition; on the condition of water shortage the contribution from sheaths to yield was highest in treatments, was 0.18 g/stem. The relationship between yield and evapotranspiation indicated that the highest theoretical yield was 6240 kg/hm2 in Yucheng under present fertilizer and management level. The evapotranspiration at highest yield was 473 mm; and the evapotranspiration was 403 mm when water use efficiency was highest. Groundwater was an important water resource in this area. Amount of water supplied by groundwater to wheat from jointing to maturity stages was 22% of total water consumption of winter wheat.

Key words: dry-matter partition, water deficiency, water use efficiency, winter wheat, yield