Effect of Irrigation Stage and Amount on Water Consumption Characteristics and Grain Yield in Wheat

To determine the effects of irrigation stage and amount on water consumption characteristics and grain yield,we experimented with the medium-gluten wheat cultivar Taishan 23 under the condition of pool culture.The results showed that the treatment W1,which irrigated 60mm water before sowing and irrigated 30mm water at middle jointing stage,obtain higher grain yield of 7 727.10 kg·ha-1 and higher WUE of 18.69 kg·ha-1·mm-1,while it had the highest IWUE.The treatment W5,which irrigated 60mm water before sowing,at late jointing stage and filling stage respectively,had the highest grain yield of 8 494.50 kg·ha-1,and treatment W5 had no significant difference with other irrigated treatments on WUE.The water consumption amount,the ratio of irrigation amount to water consumption amount,the ratio of precipitation to water consumption amount and the ratio of soil water consumption amount to water consumption amount were 464.91 mm,38.72%,36.85% and 24.44%,respectively in treatment W5 and were 413.46 mm,21.77%,41.43% and 36.80%,respectively in treatment W1.So,the treatment W1 increased the ratio of precipitation to water consumption amount and the ratio of soil water consumption amount to water consumption amount,and the treatment W5 increased the ratio of irrigation amount to water consumption amount.The soil water consumption amount in 0~200 cm soil layer had the highest of 152.16 mm in treatment W1 and the lowest of 113.61 mm in reatment W5,and the soil water consumption amount in deep soil layer of 100~180 cm in treatment W1 was significantly higher than other irrigated treatments.Under the condition of this experiment,the treatment W1 which obtained higher grain yield gave consideration to the IWUE and WUE with deficient water resources,and the treatment W5 gave consideration to the grain yield and WUE with adequate water resources.The results can offer a useful reference for formulating water-saving cultivation techniques in the areas with different water resources.