Effects of irrigation on grain yield and water use efficiency of winter wheat

Abstract

Abstract: The effects of irrigation on grain yield and water use efficiency of the winter wheat, Lingkang-2 were investigated. Five experimental treatments were designed on the basis of different irrigation amounts during the whole growing period. The soil available water content (AWC) changed with different growth stages, with a smaller value (2.37 mm) at the raising stage and larger one (9.88 mm) at the jointing stage, and with the maturity stage (2.54 mm) in between. The latter stage even had negative values in the 0-60 cm soil layers at maturity for W1 and W2. The milking stage was significantly different for all treatments. The maximum daily consumption of water was at heading-flowering and sowing-reviving, which showed that pre-winter irrigation contributes to improved emergence rates and promotes growth of winter wheat. W3 had the highest grain yield (6 296.52 kg/ha), grain weight (53.12 g) and ears per unit area (61.83 Spike×10⁴/ha) while water use efficiency (WUE) and irrigation water use efficiency (IWUE) were lower. However, compared with W3, W4 had the higher WUE and IWUE, and its grain yield was a little lower, at 6 240.37 kg/ha. Correlation analysis showed that there were highly significant positive correlations between yield and grain weight (R=0.99^**), WUE (R=0.97^**), at flowering-maturity (CA_m) (R=0.88^*), and total growth (CA_t) (R=0.88^*), indicating that water stress at the late growth stage accelerated the aging process of winter wheat, shortened the grain filling period, reduced grain weight, and eventually led to decline of grain yield. Considering the impact of different irrigation treatments on grain yield and water use efficiency of winter wheat, the W4 treatment was the most important.

CLC Number:

S512.1⁺10.7

HUANG Cai-xia, CHAI Shou-xi, ZHAO De-ming, LI Zhi-xian, CHANG Lei, WANG Ting. Effects of irrigation on grain yield and water use efficiency of winter wheat[J]. Acta Prataculturae Sinica, 2010, 19(5): 196-203.

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