Improving method of coastal high-chlorine saline soil

Abstract

The invention relates to a soil improving method, in particular to an improving method of coastal high-chlorine saline soil. The method comprises the following steps that an improving agent is added into the coastal high-chlorine saline soil for improving treatment, wherein the improving agent is at least one of humic acid and biochar; the concentration of an aqueous humic acid solution is 1-20 ppm, and the dosage of the biochar accounts for 0.5%-4% of the weight of the coastal high-chlorine saline soil; the coastal high-chlorine saline soil is slightly alkaline, TDS is at least 340 mg / L, the content of Cl<-> in the soil is not lower than 2.5 ppm, and the content of SO4<2-> is not lower than 0.5 ppm. The improving agent used in the improving method can well improve the soil property, lower soil salinity, facilitate migration of negative ions in the soil, and when the concentration of the humic acid is 15 ppm, and the dosage of the biochar is 4%, the migration effect on the Cl<-> and the SO4<2-> in the high-chlorine saline soil is the best. The use ratio of the two improving agents is high, the improving effect on the saline soil is very good, the dosage of the improving agents is low, the cost is reduced, the technology process is simple, and operation is convenient.

Description

technical field [0001] The invention relates to a method for improving soil, in particular to a method for improving coastal high-chlorinated saline soil. Background technique [0002] my country is a country where saline soil is widely distributed. According to the statistics of the second national soil census, the total area of ​​saline soil in China is 34.55 million hm 2 , about 7.6 million hm of salinized cultivated land 2 , accounting for nearly 1 / 5 of the arable land area. The main obstacle affecting the development and utilization of saline soil wasteland and tidal flat resources is soil salinization, because the soil in coastal salt areas has high salinity, low nutrient content, high groundwater salinity, serious soil salinization, and lack of aboveground and underground freshwater resources And other characteristics, these reserved land resources have not been utilized, seriously restricting the further development of agriculture in our country. [0003] Aiming a...

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Problems solved by technology

[0005] However, at present, when improving soil, there are still two important issues that have not been resolved: (1) For saline-alkali soils with different properties, the effects of chemical amendments are often very different, what kind of amendments to use and what kind of amendments are used. What kind of saline-alkaline soil can be improved by using the method has not yet reached a conclusion; (2) when determining that a certain amendment can treat a certain saline-alkali soil, how to balance the improvement effect and economic cost has not yet been deeply studied

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