Study on improvement effects of combined application of amendment and biogas slurry on moderate soda saline-alkali soil
In order to explore the reasonable scheme of combined application of modifier and biogas slurry and realize the improvement of saline-alkali land,this experiment aimed at saline-alkali land in Da'an City,Jilin Province,and studied the improvement effect of combined application of biogas slurry and modifier on soda saline-alkali soil through field experiment.The results showed that the combined application of amendments and biogas slurry effectively increased the content of soil organic matter,available phosphorus,available potassium and alkali-hydrolyzable nitrogen,increased the total porosity and the number of soil aggregates,improved the stability of soil aggregates,significantly increased the rice yield,and effectively reduced soil pH,soil bulk density,alkalinity and water-soluble salt content.Comprehensive analysis showed that the combined application of desulfurized gypsum and biogas slurry had the best effect on the improvement of soda saline-alkali soil.Compared with the treatment without biogas slurry,the content of organic matter was increased by 100%,the content of available phosphorus was increased by 34%,the content of available potassium was increased by 59%,the content of alkali-hydrolyzable nitrogen was increased by 104%,the total porosity was increased by 14%,the number of soil aggregates was increased significantly,and the stability of soil aggregates was significantly improved;The yield increase rate was 76.77%,the soil pH was decreased by 12%,the soil bulk density was decreased by 9.9%,the alkalinity was decreased by 11%,and the water-soluble salt content was decreased by 48%.
soda saline-alkali soilslurrymodifiersoil physical and chemical properties
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