Impact Assessment On Effect Of Drip Irrigation In Coastal Saline Alkali Of Cangzhou Hebei

Drip irrigation is an important way to improve the saline-alkali soil,To analysis and evaluation the effect of drip irrigation can provide an important basis for the improvement of saline-alkali land.Take the coastal saline-alkali soil of Hebei Cangzhou as the research object,based on drip irrigation test data of different water sources with different modifier ratio,Analyzed the salt reducing effects of drip irrigation with fresh water and brackish water from the changes in the amount of water and soil depth.And analyzed the salt reducing effects of drip irrigation with fresh water and brackish water from the soil quality.Results show that effect of desalination with fresh water drip irrigation was obvious on soil surface,but long-term use of fresh water irrigation can easily lead to soil deep deposition,may lead to soil salinization.The effect of brackish water irrigation on soil salinity was obvious,and this way is conducive to long-term use of soil;Aimed at the features of nitrogen deficiency,potassium rich and phosphorus is easily cured in coastal saline soil,The application amount of nitrogen and phosphate fertilizer should be increased,no excessive use of potassium rich fertilizers;The effect of fresh water drip irrigation on enhancing soil nutrient content was better than that of brackish water drip irrigation,especially the available phosphorus content in soil increased relatively greatly;The best combination of improving the quality of Cangzhou coastal muddy saline soil is the application of straw should be 0.075cm~3/m~2,the application amount of phosphorus gypsum should be 3 kg/m~2,the application amount of organic fertilizer should be 0.1cm~3/m~2,the application amount of humic acid fertilizer should be 0.08kg/m~2 and the amount of fertilizer application should be 0.0045 cm~3/m~2.Based on the orthogonal experiment design,this paper makes the range analysis and variance analysis of salt reduction effects of fresh water and brackish water drip irrigation.Graphic analyzed and compared the salt reduction effects of fresh water and brackish water drip irrigation with the change of the leaching water and soil depth.Correlation coefficient method and principal component analysis were used to evaluate the soil improvement effect of different modifier ratio under fresh water drip irrigation test.Therefore,in order to improve the soil structure of Hebei Cangzhou coastal saline-alkaline soil,rational utilization of silt saline alkali land,further study of saline alkali land improvement program is the inevitable choice of land resource utilization.