Research On Combined Application Of PAM And SAP On Water And Nitrogen Conservation And Crop Growth For Sloping Farmland In Arid Area

In order to study the effect of different application methods in sloped farmland under the combined application of PAM and SAP.In this paper,taking slope farmland in Inner Mongolia as the research object,set up four treatments CK(not used chemical material),S(PAM surface coating with SAP mixed),H(PAM mixed with SAP mixed),P(PAM surface Spraying with SAP mixed)and different treatment capacity;selected 5°and 10°slope farmland to carry out field trials,from the slope of soil erosion,Soil moisture,soil nutrients,nutrient loss,crop growth indicators,and water and fertilizer utilization efficiency,etc.,to study the effects of combined application of PAM and SAP on soil and water conservation,fertilizer conservation of root systems,and crop growth status on slope farmland in arid areas;The basic law of combined application of PAM and SAP on slope farmland provides a certain theoretical basis and application basis for reducing the loss of water,soil and fertilizer and increasing crop yield on slope farmland in dry areas.The main conclusions obtained are as follows:(1)The application of PAM and SAP has the effect of promoting the increase of the water content of the 0-40cm soil layer,especially the first 20cm soil mixed with chemical control materials.Increasing the amount of PAM and SAP can increase the water content in the soil.The effect of early S and P on the surface soil moisture is slightly higher than H,with an increase of about 3%;When H combined application,the water storage capacity during growth is the highest,followed by S combined application and P combined application,and there is no difference in water storage between them.The mixed storage of SAP is 60kg/hm2.It is the same as the SAP amount of 75kg/hm2.(2)On the 5 degree slope farmland,the combined application of PAM and SAP reduced the amount of runoff and eroded sediment loss caused by simulated rainfall,and the maximum reductions were 62.20%and 72.10%,respectively.The combined application of PAM and SAP can effectively reduce the amount of soil sediment loss,and treat the sediment of 10 degree slope farmland at the same level The loss was 57.69%and 48.49%of CK,and 40.62%and 39.49%of CK in 5 degree slope farmland,indicating that the increase in slope does not reduce the soil's ability to resist erosion after applying chemical control materials.(3)The combined application of PAM and SAP treatment can improve the ability to maintain soil nitrogen in the main root layer.The nitrogen concentration of each treatment of S combined application at flowering stage is similar;and the each treatment of H combined application,the nitrogen concentration increases with the increase of SAP dosage.Over time,precipitation carries fertilizer and nutrients infiltrate,and the total nitrogen concentration of the first 20cm soil layer with PAM and SAP is significantly higher than that of CK.At the same time,the total nitrogen in the eroded sediment after treatment The content was significantly lower than that of CK.(4)The potato plant height,main stem diameter and crown width index of PAM and SAP are all increased to a certain extent compared with CK.The difference of each index basically appears from the flowering stage to the tuber expansion stage.As the SAP dosage increases,the effect of increasing the growth of various indicators increased first and then decreased.The application of PAM and SAP in the soil can significantly increase the yield of potatoes.The dosage of PAM and SAP was 60kg/hm2,which was the best significant increase in yield.Similarly,each treatment also reduced the rate of small potatoes.Appropriate application of PAM and SAP can significantly improve the utilization efficiency of water and nitrogen fertilizers,especially HM2B2 and HM2B3,the difference is significantly more than CK.The water and nitrogen utilization efficiency of H combined application is slightly better than the other two combined applications.