Effects Of Soil Conditioner On Physical And Chemical Properties Of Saline-alkali Soil And Bacterial Community Structure

Saline-alkali soil is an important reserve land resource in China,and reasonable improvement and utilization of saline-alkali soil have important practical significance.Set ASO(0 kg/hm2),AS1(amino acid compound fertilizer 750 kg/hm2),AS2(amino acid compound fertilizer 1500 kg/hm2),AS3(amino acid compound fertilizer 2250 kg/hm2)under field test conditions for 2 consecutive years,BS0(0 kg/hm2),BS1(microbial bacterial fertilizer 750kg/hm2),BS2(microbial bacterial fertilizer 1500kg/hm2),BS3(microbial bacterial fertilizer 2250kg/hm2)a total of 8 treatments to explore its physical properties The improvement of chemical and biological traits and the effect of oat yield increase,with a view to providing new ideas for improving the utilization of saline land.The results show that:1.Soil conditioner can improve the structure of saline-alkali soil to a certain extent while increasing soil moisture content,thereby increasing the effect of soil water retention and fertilizer retention.Among them,the improvement effect of microbial bacterial fertilizer is better.The content of soil aggregates with diameter>0.25mm is increased by 6.58%-13.41%compared with the control;the soil moisture content of oats during the mature period is increased by 12.80%-15.20%compared with the control.2.Soil conditioner can effectively reduce the pH value and total salt content of saline-alkali soil,at the same time improve soil fertility and provide necessary nutrients for crop growth.Under the treatment of amino acid compound fertilizer,the soil pH decreased by 8.64%,and the total salt content decreased from 9.16g/Kg to 8.30g/Kg;while the microbial bacterial fertilizer had a significant effect on increasing the content of soil organic matter,alkaline nitrogen,available phosphorus,and available potassium.Compared with the control,it increased by 12.06%-38.49%,2.00%-11.35%,0.76%-46.21%and 13.77%-39.39%respectively.3.Soil conditioner can activate soil enzyme activity to different degrees,accelerate soil carbon and nitrogen cycle and increase soil microbial biomass carbon and nitrogen content.Microbial bacterial fertilizer has better effect due to its own active substances.4.Soil conditioner can significantly increase the bacterial richness and diversity of saline-alkali soil,and the effect of microbial bacterial fertilizer is better than amino acid compound fertilizer.Microbial manure significantly reduced the relative abundance of actinomycetes and reduced the possibility of disease.The distribution of bacterial community structure in saline-alkali soil is closely related to environmental factors such as pH,total salt content and microbial biomass carbon in saline-alkali soil.5.Soil conditioners can significantly increase crop yields.The yield of oats grains,fresh grass and hay increased by 49.38%-62.13%,48.56%-62.13%and 60.25%-69.77%respectively under the action of the two.To sum up,it can be concluded that based on the test conditions,the application of amino acid compound fertilizer 2250Kg/hm2 or microbial bacterial fertilizer 1500 Kg/hm2 is the best in the saline-alkali field.