新疆主要粮食作物滴灌条件下作物系数及水分生产率试验研究

通过3a小区试验,摸清新疆主要粮食作物在滴灌条件下作物系数和水分生产率的变化规律,为提高水资源利用效率、加强灌区用水管理、编制流域综合规划等项工作提供科学的试验数据和决策依据.采用小区试验方法,以小麦、早稻、玉米、土豆、谷子、大豆6种粮食作物为试验对象,设置灌水定额单因素4水平(300m3/hm2、375m3/hm2、...

Experiment on crop coefficient and water productivity of main grain crops under drip irrigation in Xinjiang

Through the 3 a plot tests,the change law of crop coefficient and water productivity of major grain crops in Xinjiang under drip irrigation was found out,which could provide scientific test data and decision-making basis for improving water resource utilization efficiency,strengthening water management in irrigated areas,and compiling comprehensive river basin planning.The plot experiment method was used to set irrigation quota at four levels(300 m³/hm²,375 m³/hm²,450 m³/hm²,525 m³/hm²)for six grain crops,including wheat,upland rice,corn,potato,millet and soybean.In the irrigation experiment scheme,the water demand of crops in each treatment year was measured by the measuring pit sensor,and the reference evapotranspiration of crops was calculated by meteorological data,and the relationship between yield and irrigation amount was analyzed by seed test and yield measurement.Results showed that under the condition of drip irrigation,the crop coefficients of 6 crops in each growth stage ranged from 0.45 to 1.21,and the whole growth stage ranged from 0.70 to 1.03.The water productivity of the six crops ranged from 7.65 to 81.72 kg/(hm²·mm).The water demand sensitive period of each crop is in the rapid development stage and the middle growth stage respectively.This study found out the main rules of crop coefficient and water productivity of major grain crops in Xinjiang under drip irrigation,and provided scientific data support for promoting the construction of modern irrigated areas and efficient water-saving in the fields.