Application of Compound Microbial Agent in Improvement of Soda Saline-alkali Soil
To explore the effects of compound bacteria on the improvement of saline-alkali soil,Oli-gotrophomonas and Agrobacterium with salt-resistant and alkali-resistant nitrogen-fixed bacteria were isolated and screened out for scientific and reasonable combination with existing phosphorus-soluble bacteria and cellulose-degrading bacteria in laboratory.Soil physicochemical properties,rice mor-phology,and physiological indexes were determined by pot experiment of rice.The results showed that there were significant differences among all different treatments and the control(untreated saline-alkali soil)(P＜0.05).The soil pH value of compound bacterial fertilizer group decreased by 0.92 units,and the electrical conductivity of compound bacterial agent group decreased by 27.0％.The contents of organic matter,available phosphorus and other nutrients in the compound bacteria biochar group were significantly increased,and the content of HCO3-decreased by about 54.1％.The plant height,root length,fresh weight and dry weight of the compound bacteria biochar group were in-creased by 391.5％,215.5％,1 203.8％and 1 235.7％respectively compared to the control group.The SPAD,soluble protein,SOD,and root activity in rice were increased by 262.6％,138.3％,269.8％,298.7％,respectively,and MDA in the compound bacteria biochar group was decreased by 35.6％.In general,the compound bacterial agent developed in the laboratory has a certain improve-ment effect on soda saline-alkali soil,which is better than the bacterial agent sold in the market.The combined application of bacterial agent with biochar has the most significant effect,providing techni-cal support for the repair and improvement of soda saline-alkali soil.
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