Water Requirement And Irrigation Schedule Of Drip Irrigation Wheat In South Xinjiang

Exploring the water requirement and irrigation schedule of winter wheat is of great significance for high-yield and high-efficiency production of wheat in South Xinjiang.In this paper,the growth index,the dynamic distribution of soil moisture,the change of water consumption,evapotranspiration,water consumption in different periods and the water consumption intensity in different periods of winter wheat in Southern Xinjiang are calculated by Penman formula.Finally,the stage crop coefficient of high yield and high efficiency production of winter wheat in Southern Xinjiang is determined.The following conclusions are obtained by the analysis.1.Under different water treatments,the increase of irrigation volume and irrigation frequency will affect plant height,main stem number and flag leaf SPAD value.The effect of irrigation is greater than the frequency of irrigation.Therefore,in actual production,the plant height can be regulated by the amount of irrigation to promote the formation of reasonable population structure.The different water treatment has an influence on the microclimate in the field.The soil temperature and canopy leaf temperature with the growth of 405-540 mm and the irrigation frequency are 7-10 times,and the temperature of the soil layer and the canopy leaf temperature are along with the fertility.The advance of the period is lower,which is beneficial to the photosynthetic physiological response of wheat.Increasing the irrigation and irrigation frequency can significantly increase the canopy moisture and light interception rate,and improve the microclimate in the field,and create a good environment for the growth and physiological response of wheat.2.By analyzing the water content of different soil layers,the fluctuation rang e of soil moisture content is the most intense in the soil layer of 0-40 cm.The w ater content of soil surface soil is higher.With the increase of irrigation frequency,the distribution of soil moisture is more uniform.The shallow soil bureau can be maintained by increasing the irrigation and irrigation frequency.Wet and timely s upply of moisture needed for wheat growth is conducive to the growth of wheat.3.Under different irrigation frequency,the water consumption rule from the stage of returning to green to wax maturity is,Returning green-Jointing 2.23mm/d,Jointing-Booting10.47mm/d,Booting-Flower 13.54mm/d,Flowering-Grout 19.57mm/d,grout-wax ripening 12.62mm/d;The water consumption rule of wheat under different irrigation amounts is from returning to green to wax maturityis,Return period-Jointing stage2.32mm/d,Jointing stage-Booting stage 12.31mm/d,Booting stage-Flowering stage14.27mm/d,Flowering stage-Filling stage 18.68mm/d,Filling period-Wax ripening period 12.23mm/d.4.Crop coefficient of high yield wheat field in different growth stages in Southern Xinjiang,Emergence-Overwintering Kc=0.34,Overwintering-Green Kc=0.23,Returning to green-Jointing Kc=0.8,Jointing-Flower Kc=1.16,Flower-Milk ripening Kc=1.2,Milk ripening-Wax mature Kc=0.85,Wax ripening Kc=0.47,during the whole growth period Kc=0.52,showing a trend of increasing and then decreasing.5.Through the establishment of the production function of the whole growth period,the irrigation quota,the evapotranspiration and the wheat yield are synthetically analyzed.The irrigation quota range is 484-495 mm.The irrigation quota of wheat is determined to be 484 mm by analyzing the utilization efficiency of water and the yield of wheat,and the number of irrigation times is 10 times.