Study On The Salt Distribution Of Cotton Fields Which Irrigation Under The Film In Long Term

The technology of irrigation under the film is just providing a low salt area of soil to plant byreasonable irrigation parameters. It can’t fundamentally reduce the soil salt content. To find theproblems of soil salt deposition in long term drip irrigation. Choose different drip irrigation ofland and wasteland to survey the soil salt, study the soil salt change in the natural conditionsduring the year and annual. Irrigation under the film technology in saline land of salt regulation aswell as the influence on cotton physiological traits, the migration and accumulation characteristicsof soil salt in long term irrigation under the film. Mainly the following conclusions:(1)The salt soil in the wasteland which has not irrigation and plants is deposition in the yearSurface soil salinity is higher; the snow melts control the soil salification in different years.(2)The technology of mulched drip irrigation is effect to control the salt in the wasteland,Shallow soil salt movement to deep soil; drip irrigation in5years, soil salinity have fallen to anew equilibrium state.(3)Along with the increasing length of drip irrigation, soil salinity gradually decline, theaverage survival rate of cotton、the average fluid number per and yield Tend to normalizegradually, In drip irrigation5years, the growth indicators of Cotton are close to normal level.(4)After a growth period of the irrigation regulation, Silt loam has not salt deposition in0-140cm, the loam Salt deposition in80cm(5) The0-60cm soil salt of membrane within is decreasing from seedling stage to the final,the0-20cm soil salt change little.40-60cm soil change big. the salt gathered together in80cm soil,the100-140cm soil salt change little; The0-80cm soil of between the membrane is increasingfrom seedling stage to the final, especially the surface soli, the phenomenon of Salt deposition isreduce with the depth increases, the100-140cmsoil salt change little.(6) The soil salt of0-80cm Inside the membrane and cotton narrow row is less after irrigation,the soil salt of Between the membrane change little; the soil salt of0-80cm after irrigation isgradual increase Along with the soil depth increase; In vertical direction and horizontal direction,after irrigation and before, the soil salt of Between the membrane is most than cotton narrow rowand Inside the membrane. The soil salt of inside the membrane is the membrane.(7) The soil salt sharp decline during drip irrigation3years, at this stage, soil salinitydecreased more rapidly, but the soil salt content is still high; The cotton fields from a heaviersaline-alkali land to light saline-alkali land during irrigation5years. At this stage, the Soil salinitydecreased slowly, the Salt environment could meet the normal growth of cotton; After dripirrigation5years, the Soil salinity is stable, at this stage, the technology of mulched dripirrigation on wasteland of salt control has been achieved, soil salinity environment has meet thenormal growth of cotton.