Effect Of Saline Water Irrigation Of Water Consumption Characteristics Of Wheat And Soil Water-salt Distribution

For the northwest arid areas in our country,where lack of fresh water resources,underground water level decrease year by year,salt water resources use efficiency is so low,that causing problems such as soil salinization easily.According to saline water irrigation experiment on wheat in the Shiyang river basin in arid northwest.Experiment set two factors,three irrigation water levels W1(355mm)、W2(280mm)、W3(205mm),four irrigation salinity levels S1(0.7g/L)、S2(3g/L)、S3(5g/L)、S4(7g/L). The conclusion are the following several aspects:(1)The results showed that,The decrease of irrigation water will make the spring wheat growth、yield and water consumption of wheat decreased,Compared with full irrigation, under the condition of non sufficient irrigation 11.69% lower plant height, leaf area index was 34.60% lower, yield decreased by 34.60%,with the increase of the irrigation water intensity of water consumption and water consumption increases,Compared with fresh water irrigation S1, a fall of 11.78% saline water irrigation under the condition of plant height, leaf area index declined less than 0.26cm2/cm2,yield decreased by 13.41%.wheat is more sensitive to water stress,Water and salt stress on the influence of spring wheat in the late birth more apparent,W1S2(3g/L)have little impact on the growth indexes and yield of wheat.(2)Spring wheat intensity of water consumption and water consumption is mainly influenced by irrigation water,With the increase of the irrigation water intensity of water consumption and water consumption increases,less moisture reduce water consumption of wheat,the influence of water to reduce water consumption of wheat is in the leading role,irrigation salinity effect on crop water consumption is relatively small,but with the increase of salinity increase effects on crops,and has relationship with saline water irrigation times,irrigation more salt accumulating more,then influence on crop water consumption effect more apparent;Reduce the irrigation water can be high water use efficiency,and irrigation salinity increase will reduce the water use efficiency.(3)The soil water,salt and pH distribution is mainly affected by irrigation water and irrigation salinity and the influence of soil texture. In the soil moisture,salt,pH value distribution has obvious stratification,Water and salt accumulation are more with the increase of irrigation water accumulation in the deep soil,and pH changes greatly. Reducing irrigation water for water and salt accumulation in the soil,the change of the soil pH value is smaller,continuous use saline water irrigation could lead to soil salification,and salt deposition increases with the increase of salinity and irrigation water.The most violent 20-60 cm soil moisture change,water deficit irrigation can make salt accumulation in the soil 0-80 cm,cause soil salinization,mainly in 40 cm soil pH change.