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Method for extracting soluble salt in soil

A soluble, salinity technology, applied in land preparation methods, applications, agricultural machinery and implements, etc., to achieve the effect of low water consumption and small amount of civil engineering

Inactive Publication Date: 2017-03-01
SHENZHEN MOISTUBE IRRIGATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] A method for extracting soluble salt in soil, one of the purposes is to solve the problem of extracting soluble salt from soil on the basis of environmental protection and reducing cost, so that the content of soluble salt in soil can reach the standard of normal cultivated land

Method used

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  • Method for extracting soluble salt in soil
  • Method for extracting soluble salt in soil
  • Method for extracting soluble salt in soil

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069] Example 1: Extracting Sodium Chloride from Soil

[0070] The salt content of the soil sample is 0.4%, which is clay loam, and the field water holding capacity is 29%. The change of the salt content in the soil is detected with a conductivity meter, and the soil moisture content is monitored with a soil moisture meter. The water source is tap water, which is adjusted with a pressure reducing valve. The pressure controls the water supply per unit time of the dialysis tube, and the micro-moisture tube is selected as the dialysis tube.

[0071] The soil is organized into a trapezoidal ridge with a height of 40cm, a width of 60cm for the lower step, and a width of 20cm for the upper step. A water source with a pressure regulator was connected, and a 0.5 cm thick geotextile was laid on the soil surface of the ridge as an adsorption layer.

[0072] After the water is passed through the dialysis tube, keep the water pressure at 0.02Mpa, and the water seeps out from the wall of...

example 2

[0077] In the dialysis process in Example 1, the salt in the soil directly below the dialysis tube is carried downward by the micro-water flow, and is enriched at the deep soil moisture peak. This part of the salt remains in the soil, and the deep soil The salt content of the is much higher than that of the cylindrical wet body.

[0078] After the first dialysis is completed, the water supply is stopped, and the residual salt is governed by the entropy increase principle of the second law of thermodynamics, and automatically diffuses from the high content to the low content in the cylindrical wet body, and finally disappears at the high content, and the residual salt is evenly distributed. The state of being distributed in the soil of a cylindrical wetted body. At this time, the water source is turned on again, that is, the dialysis process is performed again, and the residual salt is dialysised again.

[0079] Under normal circumstances, after the second dialysis, the salini...

example 3

[0081] The dialysis process is exactly the same without laying the adsorption layer, but since there is no adsorption layer, the salt is enriched on the soil surface during the dialysis process, and the soil surface must be directly treated.

[0082] The method is to scrape off the soil with a thickness of about 1cm on the soil surface (this layer of soil has a high salt content) and insert it into the extraction equipment, soak it with an appropriate amount of water to transfer the soluble salt in the soil to the water, and after taking it out after soaking After cleaning the soil, evaporate the water containing soluble salts in the extraction equipment to crystallize the soluble salts. The disadvantage of this method is that it is troublesome to operate, and it is labor-intensive and time-consuming.

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Abstract

The invention provides a method for extracting soluble salt in soil. The method comprises the following steps: a land to be treated is prepared into ridges with a preset specification; a dialysis tube is laid in each ridge, wherein the dialysis tubes are tubes with micropores distributed all over the tube walls, and the vertical distances from the axial centerline of the dialysis tube to all surfaces of the ridge are equal; the dialysis tubes are connected to a water delivery pipe communicating with a water source through pipe parts, such that a dialysis tube network is formed; the water source is turned on, and water is supplied for the dialysis tube network, such that a cylindrical moist body with length equal to that of the dialysis tube and with the dialysis tube as an axis is formed in each ridge; water flow in the moist bodies brings soluble salt in the soil in the ridges to the surface of the ridge soil, and the water source is turned off when the salt content in the soil in the ridges meets a preset salt content threshold; and the soluble salt at the surface of the ridge soil is extracted with a preset method. Therefore, on the bases of low cost and environment-friendliness, the soluble salt is extracted from soil, and soil soluble salt content can reach the standard for a normal arable land.

Description

technical field [0001] The embodiment of the present application relates to the field of land management, in particular to a method for extracting soluble salt in soil. Background technique [0002] Salt in the soil is an essential nutrient for crop growth, but when the salt content of the soil is higher than 0.1%, the crops will be inhibited from growing due to the stress of salt The land on which it grows is called saline-alkali soil. Saline-alkali land can be divided into mild (soil salinity 0.1-0.3%), moderate (soil salinity 0.3-0.6%) and severe (soil salinity >0.6%) according to the salinity. Known as "the skin cancer of the earth", it has serious damage and is difficult to cure. According to statistics, about a quarter of China's total cultivated land area has been threatened by salinization, which has caused the degradation of cultivated land and the decline in output capacity , directly endangering the country's food security and land security. [0003] At pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01B79/00
Inventor 杨庆理
Owner SHENZHEN MOISTUBE IRRIGATION TECH
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