Interactive effects of irrigation regime and planting density on grain yield and water use efficiency in winter wheat

doi:10.13287/j.1001-9332.202101.025

Abstract

Abstract: To get an optimal irrigation regime and planting density for simultaneous improvement of grain yield (GY) and water use efficiency (WUE) in winter wheat, we examined the responses of ‘Tainong 18’ (with bigger ears) and ‘Shannong 22’ (with medium-sized ears) under four irrigation regimes, including 0, 45, 60, and 75 mm. Those two cultivars were planted at four densities: Tainong 18 at 135×10⁴, 270×10⁴, 405×10⁴, and 540×10⁴ plants·hm^-2 and Shannong 22 at 90×10⁴, 180×10⁴, 270×10⁴, and 360×10⁴ plants·hm^-2. The interactive effects of irrigation regimes and plant densities on GY, water consumption characteristics, and WUE were investigated. The results showed that GY, evapotranspiration, soil water consumption, and WUE were significantly affected by irrigation regime, plant density, and their interaction. The optimal irrigation regime was 45 mm for both cultivars, while the optimal plant density was 405×10⁴ plants·hm^-2 for Tainong 18 and 270×10⁴ plants·hm^-2for Shannong 22, as indicated by the highest GY, the lowest ratio of soil evaporation to evapotranspiration after jointing, and higher WUE and the ratio of soil water consumption below 1 m to total soil water consumption. The rational combination of plant density and irrigation could reduce unnecessary water consumption and improve WUE.

Key words: winter wheat, plant density, irrigation regime, evapotranspiration, grain yield, water use efficiency

ZHANG Xiu, ZHU Wen-mei, DONG Shu-xin, CHU Jin-peng, FEI Li-wei, ZHENG Fei-na, DAI Xing-long, HE Ming-rong. Interactive effects of irrigation regime and planting density on grain yield and water use efficiency in winter wheat[J]. Chinese Journal of Applied Ecology, 2021, 32(1): 163-174.

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