Organic-inorganic composite modifier for improving saline-alkali soil and preparation method of organic-inorganic composite modifier

Abstract

The invention provides an organic-inorganic composite modifier for saline-alkali soil improvement and a preparation method thereof, and belongs to the technical field of soil saline-alkali improvement. The invention provides an organic-inorganic composite modifier for improving saline-alkali soil and a preparation method of the organic-inorganic composite modifier, and effectively solves the problem that saline-alkali has a serious toxic effect on soil and threatens food safety. According to the modifier provided by the invention, through an improvement technical system of'soil improvement and fertility improvement ', the problems of high alkalization degree, adhesion and hardening of the saline-alkali soil can be improved, nutrient slow release, improvement of soil organic fertilizer and supplementation of nitrogen, phosphorus and potassium nutrient elements can be realized, and the problems of alkali reduction and quality improvement of the saline-alkali soil and stable removal of exchangeable sodium are practically solved. And the problems of single improvement effect, short action period, high cost, environmental pollution and the like generally existing in chemical improvers in the prior art are also solved.

Claims

1. An organic-inorganic composite improver for improving saline-alkali land, characterized in that: The improver comprises component a and component b, wherein component a comprises aluminum sulfate, acidified zeolite, desulfurized gypsum and clay; and component b comprises urea, monoammonium phosphate, potassium sulfate, acidified biochar, salt-alkali tolerant microbial agent and coating agent.

2. The improver according to claim 1, characterized in that The salt-alkali tolerant microbial agent is prepared from Bacillus subtilis with a preservation number of CGMCC 1.821, Bacillus megaterium with a preservation number of CGMCC 1.10466, Bacillus licheniformi with a preservation number of CGMCC 1.10314, Halobacterium salinarum with a preservation number of CGMCC 1.2065, and Azotobacter beijerinckii with a preservation number of CGMCC 1.9044.

3. Use of the organic-inorganic composite modifier according to claim 1 in improving saline-alkali land.

4. The application according to claim 3, characterized in that The dosage of the organic-inorganic composite modifier is 3.5 g / kg.

5. The method for preparing the organic-inorganic composite modifier according to claim 1, characterized in that: The method is as follows: S1: After aluminum sulfate, acidified zeolite, desulfurized gypsum and clay are fully mixed, water is added, and then placed in an electric granulator to prepare small particles of component a; S2: urea, monoammonium phosphate and potassium sulfate are uniformly mixed, water is added, and then put into an electric granulator to prepare small particles, and then dried at high temperature; S3: Bacillus subtilis, with a preservation number of CGMCC 1.821, Bacillus megaterium, with a preservation number of CGMCC 1.10466, Bacillus licheniformi, with a preservation number of CGMCC 1.10314, Halobacterium salinarum, with a preservation number of CGMCC 1.2065, and Azotobacter beijerinckii, with a preservation number of CGMCC 1.9044, were activated and cultured separately and then mixed to prepare a salt-alkali tolerant microbial agent; S4: mixing the salt-alkali tolerant microbial agent with the acidified biochar at a liquid-to-solid mass ratio of 1:10, and incubating on a shaker for 12 hours to obtain biochar loaded with salt-alkali tolerant microorganisms; S5: evenly coating the small particles described in S2 with the biochar loaded with salt-alkali-tolerant microorganisms described in S4, and coating them with a coating agent to obtain small particles of component b; S6: Evenly mix the small particles of component a and the small particles of component b.

6. The method according to claim 5, characterized in that The mass ratio of aluminum sulfate, acidified zeolite, desulfurized gypsum and clay in S1 is 3:5:10:

2.

7. The method according to claim 5, characterized in that The acidified zeolite in S1 is prepared by crushing and sieving the zeolite, then slowly adding 85% industrial phosphoric acid at a solid-liquid mass ratio of 1:5, fully stirring in a blender for 12 hours, letting it stand for 2 days, and then filtering, washing, and drying to prepare the phosphate-acidified zeolite.

8. The method according to claim 5, characterized in that The diameter of the small particles of component a in S1 is 2 mm.

9. The method according to claim 5, characterized in that: The mass ratio of urea, monoammonium phosphate and potassium sulfate in S2 is 13:5:

7.

10. The method according to claim 5, characterized in that: The mass ratio of the small particles of component a and the small particles of component b mixed in S6 is 1:1.

Images