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Desalination method by using sludge to improve topsoil of saline and alkaline land

A technology of saline-alkali land and surface soil, which is applied in the field of improving saline-alkali land and using silt to improve saline-alkali surface soil for desalination. It can solve the problems of nutrient deficiency, high consumption, and slow growth of rice, and achieve the reduction of infiltration rate, improvement of soil fertility, and infiltration The effect of coefficient reduction

Inactive Publication Date: 2015-11-18
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a large amount of water is consumed during the leaching process, resulting in a waste of water resources, and the leaching and desalting time is relatively long
Desalination of saline-alkali land by water exchange technology for rice planting often results in slow growth of rice and extremely low yield due to poor soil and nutrient deficiency in saline-alkali land

Method used

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  • Desalination method by using sludge to improve topsoil of saline and alkaline land

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Embodiment 1

[0025] The present embodiment provides a method for desalinating saline-alkali topsoil by utilizing silt, which includes the following steps:

[0026] (a) Pave silt with a moisture content of 100% on the surface of the saline-alkali soil (the measured N content is about 500 mg / kg, and the P content is about 400 mg / kg), and then the soil and silt within 40 cm of the saline-alkali surface soil are mixed. Mixing (the mass percentage of silt and surface soil is 15%) to form a permeability coefficient of 5.0×10 -5 The mixed area of ​​cm / s, that is, the improved area;

[0027] (b) Surround the mixed area with silt to set up field ridges, irrigate with fresh water, and keep the water depth at 10 cm for 2 months;

[0028] (c) Plant rice in the mixed area, ensure continuous water on the surface of the mixed area during the water demand period of rice growth, the water depth is 15cm, and drain and irrigate water according to the growth characteristics and needs of rice.

Embodiment 2

[0030] The present embodiment provides a method for desalinating saline-alkali topsoil by utilizing silt, which includes the following steps:

[0031] (a) Pave silt with a moisture content of 150% on the surface of the saline-alkali soil (the measured N content is about 600 mg / kg, and the P content is about 500 mg / kg), and then mix the soil and silt within 30 cm of the saline-alkali surface soil Mixing (the mass percentage of silt and surface soil is 20%) to form a permeability coefficient of 1.0×10 -6 cm / s mixing zone;

[0032] (b) Surround the mixed area with silt to set up field ridges, irrigate with fresh water, and keep the water depth at 15 cm for 4 months;

[0033] (c) Plant rice in the mixed area, ensure continuous water on the surface of the mixed area during the water demand period of rice growth, the water depth is 20cm, and drain and irrigate water according to the growth characteristics and needs of rice.

Embodiment 3

[0035] The present embodiment provides a method for desalinating saline-alkali topsoil by utilizing silt, which includes the following steps:

[0036] (a) Pave silt with a water content of 120% on the surface of the saline-alkali soil (the measured N content is about 550 mg / kg, and the P content is about 450 mg / kg), and then mix the soil and silt within 25 cm of the saline-alkali surface soil Mixing (the mass percentage of silt and surface soil is 18%), forming a permeability coefficient of 9.0×10 -5 The mixed area of ​​cm / s, that is, the improved area;

[0037] (b) Surround the mixed area with silt to set up field ridges, irrigate with fresh water, and keep the water depth at 12 cm for 3 months;

[0038] (c) Plant rice in the mixed area, ensure continuous water on the surface of the mixed area during the water demand period of rice growth, the water depth is 18cm, and drain and irrigate water according to the growth characteristics and needs of rice.

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Abstract

The present invention relates to a desalination method by using sludge to improve topsoil of a saline and alkaline land. The method includes the following steps: a) mixing the topsoil of the saline and alkaline land and the sludge to form a mixed zone having a permeability coefficient ranging from 1.0*10-6 to 5.0*10-5 cm / s; b) using sludge to build ridges around the mixed zone, irrigating the mixed zone with fresh water for 2 to 4 months, and keeping a water depth in a range from 10 to 15 cm; c) planting rice in the mixed zone, and irrigating and draining the rice according to the growth characteristics and need of rice. Through a mixture of the topsoil of the saline and alkaline land and the sludge, the mixed zone having the certain permeability coefficient is formed, a structure of the topsoil of saline and alkaline land can be improved, the soil fertility can be increased, the appropriate growth conditions of the rice can be created, and the yield of the rice can be improved. After the structure of the topsoil of the saline and alkaline land can be improved by mixing the sludge, the permeability coefficient of the topsoil of the saline and alkaline land is decreased, the permeation rate of a fresh water soil layer is decreased, so that less fresh water can be used to maintain the continual permeation of the fresh water toward lower locations, and the salt-leaching and salt-reducing can be achieved.

Description

technical field [0001] The invention belongs to the field of saline-alkali land improvement, and relates to a method for improving saline-alkali land, in particular to a method for improving saline-alkali land surface soil by utilizing silt for desalination. Background technique [0002] Land is a non-renewable resource. With the continuous increase of population, the contradiction between man and land has become increasingly acute. Coastal tidal flats are the largest reserve resource of land in our country. The tidal flat area in my country is about 2.5 million hm 2 , and with 5000hm per year 2 The left and right land forming speeds extend to the sea. The development and utilization of tidal flats can increase arable land in a large area and alleviate the conflict between man and land. But at present, the high salinity of tidal flat soil, high mineralization degree of groundwater, and serious soil salinity damage are the main limiting factors restricting the development...

Claims

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Application Information

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IPC IPC(8): A01B79/02
CPCA01B79/02
Inventor 朱伟包建平辛沛张会文魏代伟舒实吕一彦吴思麟
Owner HOHAI UNIV
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