Effect Of Different Improvement Measures On Regional Soda Saline Soil And Maize Growth

Tongliao City,located in the West Liaohe Plain,is an important grain production base in Inner Mongolia Autonomous Region and is known as the"granary of Inner Mongolia".The West Liaohe Plain is a typical soda-saline soil with severe alkalinization,poor drought resistance and low soil nutrient content.In this study,the soda-saline soil of West Liaohe Plain was used as the test soil to investigate the effect of different improvement measures on the improvement of soda-saline soil.The experiment was set up to apply a single amendment（desulfurization gypsum（T）and calcium superphosphate（G））and a combination of amendment measures（desulfurization gypsum with calcium superphosphate（TG）and calcium superphosphate with straw（GJ））,and to make a comprehensive evaluation of the improvement effects and to select suitable improvement measures for soda saline soils.The results of the study are as follows:（1）All amendments reduced soil p H and alkalinity（ESP）to varying degrees,with the application of FGD gypsum treatment reducing p H the most,by 0.63 units compared to the control;The greatest reduction in ESP was observed in the calcium superphosphate with straw treatment,with a 10.09%reduction compared to the CK treatment（P<0.05）.The Na⁺content of each amended soil was significantly reduced compared to the control,while the Mg²⁺,Ca²⁺,HCO₃^-and SO₄^2-contents were increased.（2）Except for the T treatment,all other amendments promoted the nutrient content of the soda saline soil to different degrees,and the calcium superphosphate with straw application treatment enhanced the effect better,while the FGD treatment alone reduced the effective phosphorus content of the soil by 23.21%from seedling to nodulation compared with the control.（3）The AHP-based fuzzy integrated evaluation method,the gray correlation method and the modified Nemero index method were selected to evaluate the soil fertility,and the results showed that the application of calcium superphosphate with straw had a better effect on soil fertility.（4）All improvements promote corn growth,improve corn emergence and seedling retention,and increase plant height,stalk thickness and leaf number.The treatment with FGD gypsum application had a greater promotion effect on seedling emergence and seedling retention of maize,increasing by 3.7%and 4.5%,It increased maize yield by26.29%compared to the control.The combined improvement measure calcium superphosphate with straw had a better yield increase of 22.53%over the CK treatment（P<0.05）.（5）The results of the comprehensive evaluation of the improvement effect of soda saline soil using principal component analysis showed that the size of each treatment score was in the following order:GJ>TG>T>G>CK,and the effect of improving soda saline soil with calcium superphosphate with straw treatment at the time of application was better with a score of 0.969.In summary,this study conducted experiments on the effects of different improvement measures on salinity,nutrients and crop yield and growth of soda saline land,and finally screened calcium superphosphate with straw as a suitable improvement measure for soda saline land in West Liaohe Plain.