Improvement method for laying film below coastal saline-alkali soil plough layer for salt resistance

Abstract

The invention belongs to the technical field of agricultural production, and particularly relates to an improvement method for laying a film below a coastal saline-alkali soil plough layer for salt resistance. The method comprises the steps that according to field soil salinization and texture conditions of coastal saline-alkali soil, the groundwater salt content and variation ranges thereof, the film is laid below the saline-alkali soil plough layer by selecting a corresponding scheme according to the depth required by crop root system growth, and plough layer soil on the cured film is improved. Accordingly, by laying the slat-resistant diaphragm below the plough layer, the plough layer soil is subjected to irrigation salt leaching, decomposed organic fertilizer is applied in a combined mode, the phenomenon that salt-containing ground water is transported to the plough layer can be stopped, leaching is conducted to lower the salt content of the plough layer soil, fimic plough layer soil is improved, tillage planting is not affected, the purposes of improving the saline-alkali soil, protecting seedlings and increasing the yield are achieved, the method has the advantages of being simple, high in applicability and easy to popularize, the method is applied and popularized in a large area of the coastal saline-alkali soil, and significant economic, ecological and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of agricultural production, and in particular relates to a salt-resistance improvement method for laying a film under a cultivated layer in coastal saline-alkali soil. Background technique [0002] my country's coastal saline-alkali land is widely distributed in coastal areas, with serious salinization, large area and increasing trend year by year. It is an important reserve land resource to be developed and utilized. The improved development and agricultural utilization of coastal saline-alkali land can not only expand the area of ​​cultivated land in coastal areas and increase crop yields, but also bring into play the potential value of saline-alkali land, promote the development of agricultural production in coastal areas, and improve regional economic benefits. National food security has important practical significance. [0003] The problems of coastal saline-alkali land mainly lie in high groundwater ...

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Problems solved by technology

[0004] The existing improvement technologies are mainly lowering the groundwater level, draining salt and alkali in plowed layer soil, soil fertilization, etc. Among them, the technical measures for lowering the groundwater level include shaft drainage, shallow wells for alkali drainage, deep trenches for alkali drainage, and terraced fields. Water conservancy engineering technical measures such as planting, farming and fishing, and underground pipe alkali drainage can effectively reduce the groundwater level. It is easy to collapse and become shallow and damaged; the technical difficulty and maintenance cost of the alkali-improving underground pipe are high, and the initial use effect is better, but it is easy to be blocked and discarded after large-scale long-term use; For local small area application

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