Alkali-saline land productivity recovery method

A restoration method and productivity technology, applied in land preparation methods, soil lifting machinery, agricultural machinery and implements, etc., can solve the problem of consuming large water resources, save water resources, increase water holding capacity, and facilitate promotion.

Active Publication Date: 2014-05-21
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for restoring salinized land productivity, which can still maintain the land productivity in arid areas under the

Method used

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  • Alkali-saline land productivity recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Apply biochar to the soil at a depth of more than 30cm in the oasis farmland, and the application amount is 5% by weight; the application method is mixed application, that is, the biochar is evenly mixed with the soil.

[0017] (2) Plant crops, and use common field management methods such as irrigation, fertilization, and weeding to complete a round of crop planting and harvesting.

[0018] During this round of crop cultivation, due to the application of biochar, the Na in the soil + , Cl - and SO 4 2- Compared with the land without biochar application, the iso-salinization ion accelerates the enrichment to the soil surface above 2cm ( figure 1 ). This depth is above the rhizosphere layer of crops, so the enrichment of saline-alkali ions in this depth does not affect the normal growth of crops, but provides conditions for the removal of saline-alkali ions in the soil.

[0019] (3) Before the next round of crop planting, remove the soil layer at a depth of about...

Embodiment 2

[0022] (1) Apply biochar to the soil at a depth of more than 30cm in the oasis farmland, and the application amount is 10% by weight; the application method is mixed application, that is, the biochar is evenly mixed with the soil.

[0023] (2) Plant crops, and use common field management methods such as irrigation, fertilization, and weeding to complete a round of crop planting and harvesting.

[0024] During this round of crop cultivation, due to the application of biochar, the Na in the soil + , Cl - and SO 4 2- Compared with the land without biochar application, the iso-salinization ion accelerates the enrichment to the soil surface above 2cm ( figure 1 ).

[0025] (3) Before the next round of crop planting, remove the soil layer at a depth of about 2cm from the surface of the land, and then plant the crops.

[0026] The removed surface soil layer can be piled up separately. After accumulating to a certain amount, the saline-alkali ions can be removed by rinsing and re...

Embodiment 3

[0028] (1) Applying biochar to the soil at a depth of more than 15cm in the arid area farmland, the application amount is 5% and 10% by weight; the application method is mixed application, that is, the biochar is evenly mixed with the soil;

[0029] (2) To plant crops, use the soil moisture controller to perform precise irrigation according to the optimal soil moisture content required by the crops, and cooperate with other common field management methods such as fertilization and weeding to complete a round of crop planting and harvesting.

[0030] During this round of crop cultivation, due to the application of biochar, the Na in the soil + , Cl - and SO 4 2- The iso-salinization ions are accelerated and enriched to the soil surface above 2cm, which also produces similar figure 1 The results shown.

[0031] (3) Before the next round of crop planting, remove the soil layer at a depth of about 2cm from the surface of the land, and then plant the crops.

[0032] The remove...

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Abstract

The invention discloses a alkali-saline land productivity recovery method. The method is characterized by comprising the following steps: (1) applying biochar in a land in a dry area, wherein the weight ratio of the application amount is 1 percent to 10 percent; (2) after one turn of crops are planted and harvested, and before the next turn of crops are planted, removing a soil layer with thickness more than 2cm from a land surface. Because of the application of the biochar, the saline and alkaline ions are promoted to be enriched above 2 cm of the soil layer, so that conditions are provided for a dry method productivity recovery method; the field moisture capacity of the land can also be improved by the application of the biochar; water conservation and crop growth are facilitated; the soil air permeability is improved; the soil quality is improved; the crop yield and the land productivity are improved; the method is easy to operate and convenient to popularize.

Description

technical field [0001] The invention relates to a method for improving land, in particular to a method for improving saline-alkali land. Background technique [0002] There is a large arid area in northern China, and agricultural production in this area is completely dependent on irrigation. The arid climate background, irrigated agriculture and high evaporation determine the inevitability of land secondary salinization. Under the dynamic conditions provided by evaporation, salts and alkali ions such as SO42-, Cl- and Na+ in the lower soil are carried by the soil capillary water that migrates upwards to the crop rhizosphere soil and accumulate, resulting in physiological water shortage and Poisoning, thereby making the land lose its productive capacity. For thousands of years, in order to deal with secondary salinization of soil and maintain the productivity of oasis land, people have been using the method of flood irrigation. Flood irrigation is usually carried out on th...

Claims

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Application Information

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IPC IPC(8): A01B79/00A01B77/00
Inventor 李心清杨放王荣梅
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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