Effect Of Different Planting Methods On The Soil Water-salt And Nutrient Transfer Under Drip Irrigation

Along with the rapid population growth,per capita cultivated land area decreases,and the contradiction between the two is deepened,and large areas of saline land have been abandoned,fails to be used as the reserve land resources.If we can ameliorate the saline-alkali land,it is of great significance to solve the problem of insufficient per capita arable land.Surface drip irrigation with high frequency,small flow rate,long time,not only can be washed out soil salt,still can enhance plant roots absorbing water,can achieve the province water,fat,energy saving,keep moisture,improvement of saline land,but also has obvious economic benefits and social benefits and ecological benefits,reasonable allocation of irrigation water resources for irrigation and water saving irrigation system planning layout and the improvement and development of saline-alkali land has important significance.This study,through setting different fertilizer rate and different planting patterns on saline-alkali land in datong basin,uses drip irrigation fertilization technology to plant M.Linn.The fertilizer rates,using 36-72-180 kg/hm²?K₂O-P₂O₅-N?for standard fertilizer level?100%?,are divided into 0%,40%,70%,100%and 130%five levels.The planting patterns are divided into ridge culture without membrane,ridge culture with membrane,flatten culture without membrane,flatten culture with membranethe.This restarch used field capacity to calculate irrigation amount.The effect of planting methods on the soil water-salt and nutrient transfer under drip irrigation is studied.The main results are as follows:1)The M.Linn is suitable to be cultivated in extremely mild salinized soil and extremely mild to mildly alkaline soil?The pH value is 8⁹,The EC is 0.2⁰.7mS/cm?;The M.Ledeb is suitable to be cultivated in mild to severe saline soil and moderate to severe alkaline soil?The p H value is 9¹0,The EC is0.7¹.6mS/cm?;2)After fertigation,in addition to the highest rate of other groups of the surface soil salt content have significantly decreased,soil conductivity peak against the far away from the head of the horizontal and vertical direction of migration of15 cm,of which 70%of the rate of soil conductivity best leaching effect;The pH of surface soil decreased with the increase of fertilizer.Rate of comparison of different drip irrigation fertilizer,the soil nutrient distribution found in the soil phosphorus,available phosphorus and potassium nitrate content increased with increased fertilizer rates,including rapidly-available potassium horizontal migration distance is greater than the vertical direction;The rapid phosphorus is difficult to be washed,mainly distributed near the drop head;Nitrate nitrogen is easy to be washed,and distributes widely in soil.Comprehensive comparison of soil conductivity,p H and nutrients treated with fertilizer was the best performance.3)The soil moisture content of furrow is obviously lower than that in the film,and the soil moisture content is similar and greater than the former.During planting,the effect of drip irrigation on soil salinity was better,and the surface soil conductivity and p H decreased more,and the effect was more obvious after laminating.Due to the rapid migration of nitrate nitrogen and rapid potassium migration,the two are easy to be collected in corrugation,which can significantly reduce the trend and distribute it to the roots of crops.4)Studies on plant growth under different drip irrigation and planting methods showed that the high and yield of alfalfa plant in the 100%fertilizing group was higher than that of other groups.The high yield and yield of alfalfa plant were higher than that of other planting methods.