Study On The Auxiliary Effect Of Leaching On Soda Alkali-saline Soil Improvement Of Aluminum Sulfate

This study about Qianguo Village of Songnen areas, the use of laboratory simulation in the form of aluminum sulfate added after the analysis of the effects of leaching. Add aluminum sulfate were selected concentrations of 0%,0.2%,0.4%, 0.6%,0.8%,1.0%,1.2% were determined to study the situation in each of these seven washing once, twice, three times, the soil Ion concentration in solution and the main trend, and after adding these seven concentrations were determined physical properties. The main results are as follows:Effectively improve the leaching of soil salinization degrees. The amount of aluminum sulfate added in certain circumstances, with the increase in the number of leaching, sulfate and chloride ion concentration of anions decreased. Carbonate and bicarbonate have decreased significantly, but by the impact of carbon dioxide in the air, and the rate of decline of sulfate and chloride ions is not fast, but also significantly improve the soil ion results, make the soil more suitable for crop growth.Significantly improve soil leaching chemical composition of the role, but added to the sulfuric acid leaching of aluminum as there are a lot of passes, while the effect of shocks such as the first part of the formation of aluminum sulfate into aluminum sulfate hydrolysis of colloid have been destroyed, Of the aluminum sulfate soil improvement effect. Meanwhile, the leaching process also undermined the shock any original soil aggregates and micro-aggregates, many physical properties of the soil leaching did not improve, even in terms of soil solution pH, the negative effects.When not leaching the soil, add aluminum sulfate to effectively improve the soil properties, in particular, to reduce the degree of soil alkalization, the effect is obvious. Soil pH, soil bulk density, soil particle size and other aspects of the role of soil have been improved, and the effect is obvious. Plasma calcium and magnesium along with the addition of aluminum sulfate was released, to some extent, also played a role in reducing the degree of soil salinization. However, improvement of aluminum sulfate alone, and not a comprehensive solution to the problem of soil Songnen Plain. There are high due to soil salinization degree of aluminum sulfate was not effective in improving the degree of soil salinity problems, and even add aluminum sulfate salts when the content of the soil increased. Therefore, aluminum sulfate to the soil type is converted to sulfuric acid from the soda-type model, the problem is alleviated, but not completely resolved.Integrated aluminum sulfate and leaching pros and cons of the two improved methods, improved ways of combining the two to get both to improve the problem of soil basicity, but also can improve the degree of soil salinity problems, and better improve the soil environment. Add aluminum sulfate at 0.8%, the leaching of soil twice, I think we can achieve the best improvement in results.