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Drainage salt-washing method for green belt of heavy saline-alkali land development region in coastal area

A technology for saline-alkali land and development zones, which is applied in the fields of soil preparation methods, climate change adaptation, agricultural machinery and tools, etc. It can solve the problems of high sand content in heavy saline-alkali land, high cost of washing salt with fresh water, and shortage of fresh water resources. Enhance soil infiltration capacity and avoid the effect of too slow infiltration speed

Inactive Publication Date: 2016-04-13
无锡市绿化建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a traditional method, on the one hand, uses fresh water to wash the salt, and the cost of washing salt is relatively high, and fresh water resources are relatively scarce; Digging the soil is a large project and takes a long time

Method used

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  • Drainage salt-washing method for green belt of heavy saline-alkali land development region in coastal area
  • Drainage salt-washing method for green belt of heavy saline-alkali land development region in coastal area
  • Drainage salt-washing method for green belt of heavy saline-alkali land development region in coastal area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for draining and washing salt in green belts of heavily saline-alkali land development zones in coastal areas, comprising the following steps: (1) spreading 50g to 80g of loose soil concentrate on the soil surface of each mu of heavily saline-alkali land, and laying 200 kg to 300 Kg of rice stalks can also be replaced by corn stalks or wheat stalks. The soil in heavy saline-alkaline land is turned over to make the straw evenly mixed in the soil. The depth of 50cm, the root system of trees is mostly around 60cm, in order to ensure that the water can quickly reach the root system of the vegetation and facilitate the absorption of the root system, so the depth of the soil is set to 50cm ~ 80cm;

[0019] (2) Bury alkali discharge pipes on the inclined embankment at the bottom of the heavy saline-alkali land, and set up a drainage ditch and a reservoir on the side of the heavy saline-alkali land. The reservoir is equipped with a water pump and a water delivery pump, ...

Embodiment 2

[0023] This example is the verification of the infiltration rate of fresh water and brackish water in unimproved heavily saline-alkali soil.

[0024] Preparation of the test soil column 1: The test soil was collected from the Xintan Salt Field Development Zone in Yancheng City. After air-drying, crushing and sieving, each layer is evenly mixed, it is layered into a PVC pipe with a height of 120cm and a diameter of 50cm. For the receiving device, there are salinity sensors buried at 30cm, 60cm, and 90cm in the PVC pipe. According to the data feedback of the salinity sensor, the time when the wetting peak reaches the corresponding embedding depth of the salinity sensor is determined.

[0025] Test solution one: fresh water with a salinity of 0.42g / L.

[0026] Test solution two: add sodium carbonate on the basis of test solution one, the degree of salinity is 2.92g / L, and the concentration of sodium carbonate is 2.5g / L.

[0027] Test solution three: add sodium carbonate on the ...

Embodiment 3

[0034] This example is the verification of the infiltration rate of fresh water and brackish water in heavy saline-alkali soil improved by straw.

[0035] The difference between this example and Example 2 lies in the preparation of the test soil column 2.

[0036] Preparation of the second soil column for the test: different from the first soil column for the test, 88.3g of 88.3g rice straw (equivalent to 300 kg of rice straw per mu, with a depth of 80 cm).

[0037] Table 2: Moisture migration characteristics of different test solutions in test soil column 2

[0038]

[0039] Experiments show that when the wetting peak reaches the 90cm place of the test soil column 2, use brackish water or brackish water made by adding sodium carbonate to fresh water, as shown in test solutions 2, 3, 4, and 5, the irrigation needs only 41 to 58 hours, while freshwater irrigation takes 277 hours. Compared with the related experiments in Example 2, the soil quality of the test soil column ...

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Abstract

The invention provides a drainage salt-washing method for a green belt of a heavy saline-alkali land development region in a coastal area. The method can effectively reduce engineering cost, greatly shortens engineering time, and can realize effective desalination of saline-alkali soil of the green belt. The method comprises the following steps: (1) laying 200 kilograms to 300 kilograms of straws on the soil surface of the heavy saline-alkali land per mu, then subjecting the soil of the heavy saline-alkali land to soil-turning operation, and allowing the straws to be uniformly doped in the soil, wherein a soil-turning depth is 50 cm to 80 cm; (2) embedding alkali-discharge pipes in a tilted dike located at the bottom part of the heavy saline-alkali land, arranging a drainage ditch at one side of the heavy saline-alkali land, and allowing one downward-tilted end of each alkali-discharge pipe to communicate with the drainage ditch, wherein the depth of each alkali-discharge pipe embedded in the dike is 1 m to 1.2 m, and the separation distance of adjacent alkali-discharge pipes is 5 m; and (3) implementing irrigation to the heavy saline-alkali land with underground brackish water as a water source.

Description

technical field [0001] The invention relates to a method for improving heavy saline-alkali land, in particular to a method for draining and washing salt in a green belt of a heavily saline-alkali land development zone in a coastal area. Background technique [0002] In my country, there are about 100 million hectares of saline-alkali land, which is equivalent to the planting area of ​​crops. Part of the saline-alkali land has been developed and utilized through various methods such as building development zones, planting crops, and raising fish in ponds, but 80% of the saline-alkali land has not yet been utilized. . At present, domestic technologies for improving saline-alkali land mainly include the following aspects: Engineering measures: drainage and salt washing, alien soil pressure alkali, sand pressure sand control salt blasting salt spots, Agricultural measures: leveling the land, deep plowing, building terraces, planting green manure, burying straw, Forestry mea...

Claims

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Application Information

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IPC IPC(8): A01B79/00
CPCY02A40/10
Inventor 周光
Owner 无锡市绿化建设有限公司
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