Effects of Spatial-temporal Dynamics in Crop Water Consumption on Grain Yield of Winter Wheat

Abstract

【Objective】 The effect of water consumption of winter wheat varieties on yield was investigated to provide theoretical basis for selecting drought-resistant varieties to improve winter wheat yield in water-deficient areas. 【Method】 A two-factor randomized block design was adopted, Cangmai 6002 (CM6002) and Heng 4399 (H4399) were used as the main treatments. Three water treatments were set for each variety: no irrigation in the whole growth stage (W0), spring first water (irrigation at jointing stage, W1) and spring second water (irrigation at jointing stage and anthesis stage, W2), each irrigation amount was 60.0 mm. The effects of water consumption difference in different growth stages and soil layers on winter wheat yield were studied. 【Result】 There was no significant difference between CM6002 and H4399 in total water consumption, soil water storage consumption and its proportion in total water consumption, but there was a great difference in water consumption at different stages. From sowing to jointing stage, soil water storage consumption and water consumption of CM6002 were higher than H4399, but there was no significant difference among varieties. From jointing to anthesis stage, CM6002 soil water storage consumption and water consumption were significantly lower than H4399. From anthesis to maturity, water storage consumption and water consumption of CM6002 were higher than those of H4399, and there were significant differences between the two cultivars under W1. Under W0, soil water storage consumption of CM6002 in 120~200 cm soil layer was significantly higher than that of H4399. Under W1 and W2, soil water storage consumption of H4399 in 0~40 cm soil layer was significantly higher than that of CM6002, but that in 120~160 cm soil layer was significantly lower than that of CM6002. Compared with H4399, CM6002 decreased the pre-anthesis dry matter mobilization, dry matter mobilization efficiency and contribution rate to grain, but increased the post-anthesis dry matter accumulation and contribution rate to grain. The yield of CM6002 was 2.7%, 1.3% and 3.2% higher than that of H4399 for W0, W1 and W2, respectively. 【Conclusion】 Under the experimental conditions, reducing water consumption from jointing to anthesis, increasing water consumption from sowing to jointing, anthesis to maturity and deep soil water storage consumption were beneficial to increase winter wheat yield.

Keywords

• winter wheat varieties
• water consumption characteristics
• dry matter accumulation
• yield