Saline-alkali land treatment method

Abstract

The invention discloses a saline-alkali land treatment method. The method is a rapid treatment method with which investment is low, efficiency is high, desalination can be realized, and the saline-alkali land can be fertilized. According to the invention, a simple water-storage salt-removing facility is built; soil is desalinated with full utilization of the natural precipitation of rainy seasons; production and reproduction of aquatic algae such as spirogyra and moss are promoted, such that water surface coverage is formed; during a water shortage, the cover blocks soil moisture evaporation to prevent re-salinization, and the desalination effect of soil during the rainy seasons is maintained; with the death and decomposition of the algae, soil organic matters can be increased, soil structure can be improved, and soil fertility can be improved.

Description

technical field [0001] The invention relates to the technical field of agricultural land preparation. More specifically, it relates to a saline-alkali land treatment method. Background technique [0002] The coast of Jiangsu has more than 10 million mu of tidal flats, accounting for more than 30% of the total area of ​​tidal flats in China, and it still grows at a rate of about 30,000 mu of land formation every year. This vast tidal flat resource is the most potential endowed by nature to the eastern region. Land reserve resources play an irreplaceable role in supplementing insufficient cultivated land resources and ensuring national food security. However, the newly reclamated tidal flats have high salinity and poor soil, and the use of conventional technology to improve them requires a large amount of fresh water or high cost, especially most of the newly reclaimed tidal flats along the coast of Jiangsu have relatively high terrain (such as the "First Wei" in Jiangsu) 40...

AI Technical Summary

Problems solved by technology

However, the newly reclamated tidal flats have high salinity and poor soil, and the use of conventional technology to improve them requires a large amount of fresh water or high cost, especially most of the newly reclaimed tidal flats along the coast of Jiangsu have relatively high terrain (such as the "First Wei" in Jiangsu) 400,000 mu of Tiaozini, Jinhai Farm, Huanghai Farm, etc.), and the nearby large rivers (such as Dongtai River, Liangduo River, Fangtang River, etc.) have difficulty in water supply, and must rely on power to lift water, which is costly. The utilization rate of natural precipitation (annual average precipitation is 1022.7 mm) is not high, and a large amount of precipitation returns to the sea through surface runoff, causing serious waste of water and soil erosion

[0003] The existing mature saline-alkali land improvement technology mainly relies on a large amount of fresh water irrigation to wash the salt, and then plant rice. For example, the improvement technology of desalination rice planting in the 10,000-mu salt field of Shuntai Farm in Jiangsu Province requires deep plowing, drying the field, soaking in fresh water, and repeating 3 times of rotary tillage. More than 50% of the conventional chemical fertilizers can achieve high rice yields. Even so, dry grains cannot be planted within 3 years of reclamation, and soil desalination in dry seasons has not been achieved; The infiltrated salt is discharged to the outer ditch, which is costly and expensive, and cannot increase soil organic matter; some improvement measures of saline-alkali soil conditioners can only alleviate the salt damage of plants, but cannot eradicate the salinity in the soil, nor can it significantly increase the organic matter content of the soil; The leaching and desalination technology using crop straw mulching has strong limitations: it requires a large amount of crop straw, which is not resistant to wind, difficult to lay, difficult to crush and return to the field, and has no water storage capacity. It can only improve sandy soil with good leakage; Some improvement measures such as cow dung and urban sludge have problems such as large investment and heavy metal pollution.

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