The Influence Of Physiological Characteristics And Water Use Efficiency For Different Crop Varieties Under Salt Stress

Hetao irrigation area is the typical area of soil salinization, soil salinization is restricted agriculture sustainable development in hetao irrigation. Improve crop yield and water use efficiency in salinization area, in addition to considering irrigation technology and improve soil conditions, screening the crop varieties about resistanting salt characteristics. This paper choose the typical regions of Hang Jinhouqi for background, choose the typical crop varieties sunflower(5009、135、562、S31)、corn(badan3、 zhengdan958、neidan314)、potato(kexin1、jizhangshu8) for experimental investigation, analysis the differences about each crop varieties under salt stress, and established the optimal irrigation system based on WIN ISAREG model. The results has important reference value for the local agricultural production. Through the field experiment and analysis, drawing the following main conclusions:(1) In four sunflower varieties,compared the growth、Physiological Characteristics、 the production and water use efficiency four varieties of sunflower under salt stress condition, In all the factors of the optimal performance562is good, Water use efficiency could reach20.78kg/(hm2·mm), belong to high water use efficiency. Second for5009,135and S31performance at a disadvantage, suggest that choose562in the soil salinization.(2) In three corn varieties,badan3is the optimal performance in mild soil salt, water use efficiency reached37.85kg/(hm2·mm). When salt concentration was more than0.4%, badan3clearly influenced by the inhibition, and neidan314was the best in salt tolerance, and no serious production, water use efficiency reached23.25kg/(hm2·mm). Suggest that select neidan314in moderate soil salinization.(3) In two potato varieties, kexinl is obviously superior to jizhangshu8, commodity rate of kexinl reached95%, higher16%than Ji zhangshu.8, and water use efficiency reached128.77kg/(hm2·mm), suggest that select kexin.1in mild saline soil.(4) The actual evapotranspiration were no significant difference between Each crop varieties, the sunflower actual’evapotranspiration was300～310mm in mild saline soil,270～280mm in moderate soil salinization,230～240mm in severe saline soil; The corn actual evapotranspiration was390-400mm in saline soil, The key water requirement period was tasseling-grouting, in this period should be added moisture to ensure grain formation; The potato actual evapotranspiration was about286mm in saline soil, in the formation of the tuber should maintain a certain amount of soil moisture, too much soil water will make fruit rot lead to losses.(5) Based on the optimal selection of the sunflower、corn、potato, evaluated the irrigation system, established irrigation system, so as to guide the local agricultural production for the soil salinization...