The Study Of Straw Buried On Saline-alkali And Nutrient Regulation Of Soil

Soil salinization is a very important factor limiting agricultural production. In the circumstances of local high groundwater level,low precipitation,high evaporation, and coupled with upward movement of soil salt accumulation in the surface soil lead to the poor grop yields in the area of TuMoChuan plain. This experiment is use the straw buried to improve Saline Soil in TuMoChuan plain, through analysis of nutrient and alkalization indicators of soil samples after straw buried to study the effect of different straw buried on saline-alkali and nutrient regulation of soil.The main results are as follows:The results show that the straw buried can destroy the continuity of the capillary in study area, and inhibit salt accumulation in surface soil,reduce the salt content of plow layer,improve the pH environment of soil,and improve the nutrient content of plow layer.The treatment which buried the straws at 30cm was the optimal treatment.After four months later,the total amount of salt was decreased by 2.50g/kg, desalination rate was 45.5%,among them,the content of anions such as HCO3-,SO42-,CL-was reduced by 50.00%,52.65%,52.63% respectively.The content of cations such as Ca2+,Mg2+,Na+ and K+ was reduced by 52.94%,50.00%,52.78%.The pH and degree of alkalization was decreased by 0.31 and 15.14%.The content of soil organic matter,alkaline hydrolytic nitrogen,available phosphorus were increased by 10.68%,11.86%,16.30% respectively compared with the CK.