Method for improving alkali soil by using products of coal desulfurization

A technology for improving soil and products, applied in the direction of soil conditioning materials, chemical instruments and methods, applications, etc., can solve problems affecting the effect of improvement, achieve obvious improvement effect, fast improvement speed, and increase biological yield

Inactive Publication Date: 2005-08-17
TSINGHUA UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the predecessors used gypsum to improve the soil, the calculation of the amount of gypsum mainly considered the difference between the exchangeable sodium minus 5% or 10% of the degree of alkalization, which was used as the basis for the amount of gypsum. For Na 2 CO 3 , NaHCO 3 , when the amount is large, it will be included in the amount of gypsum applied, and if it is small, it will be ignored, and the exchangeable magnesium will not be included in the calculation. In this way, the amount of gypsum applied will be less than the amount required for actual improvement, which will affect the effect of improvement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Slightly alkalized soil: For the soil with an alkalization degree of 10%, using the above method, the application rate of desulfurization products is 1212 kg / mu, the plowing depth is 20cm, and the irrigation water is controlled at 150 cubic / mu. The crops planted in 2003 are Grain corn, the variety is Zhedan No. 7, the sowing rate is 1.75 kg / mu, and the sowing date is May 1-3. The emergence rate of the year was 100%, and the grain yield was 584 kg / mu, which was 60.4% higher than that of the control area. For the reduction degree of 17%, using the above method, the application rate of desulfurization products is 1500 kg / mu, the plowing depth is 20cm, the crops planted in 2003 are grain corn, the variety is Zhedan 7, and the sowing rate is 1.75 kg / mu , the sowing date is May 1-3. The emergence rate was 100%, and the grain yield was 621 kg / mu, which was 70% higher than that in the control area.

Embodiment 2

[0026]Moderately alkalized soil: For the soil with a reduction degree of 20%, using the above method, the application rate of desulfurization products is 1560 kg / mu, the plowing depth is 20cm, and the irrigation water is controlled at 200 cubic / mu. The crops planted in 2003 are Grain corn, the variety is Zhedan No. 7, the sowing rate is 1.75 kg / mu, and the sowing date is May 1-3. The emergence rate of the year was 100%, and the grain yield was 748 kg / mu, which was 67% higher than that of the control area. For the soil with an alkalization degree of 28%, using the above method, the application rate of desulfurization products is 2067 kg / mu, the plowing depth is 20 cm, and the crop planted in 2003 is grain corn, the variety is Zhedan 7, and the sowing rate is 1.75 kg / mu, the sowing date is May 1-3. The emergence rate of the year was 100%, and the grain yield was 848 kg / mu, which was 90% higher than that of the control area.

Embodiment 3

[0028] Severely alkalized soil: For the soil with an alkalization degree of about 32%, using the above method, the application rate of desulfurization products is 2230 kg / mu, the plowing depth is 20cm, and the irrigation water is controlled at 100 cubic / mu. In 2003, the crops were grain The variety of corn is Zhedan 7, the sowing rate is 1.75 kg / mu, and the sowing date is May 1-3. The emergence rate of the year was 93%, and the grain yield was 751 kg / mu, while the grain yield in the control area was only 41.4 kg / mu. For the soil with a reduction degree of 79%, the application rate of desulfurization products is 4708 kg / mu, and the plowing depth is 40cm. The dates are May 1-3. The emergence rate of the year was 88%, and the grain yield was 492 kg / mu, while the grain yield in the control area was only 41.4 kg / mu.

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PUM

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Abstract

The method of utilizing fuel coal desulfurizing product in improving alkali soil includes first sampling soil; testing and calculating Na2CO3, NaHCO3, Mg(HCO3)2, Na and Mg amount to be increased or decreased and molar CaSO4 amount needed for improvement based on the formulae; calculating the needed desulfurizing product amount according to the desulfurizing product components; and applying the desulfurizing product to the surface of soil and irrigation. Compared with available technology, the present invention has the advantages of fast improving speed and high improving effect.

Description

technical field [0001] The invention relates to a soil improvement process, in particular to a method for improving alkaline soil by using coal-burning desulfurization products, and belongs to the technical field of soil improvement. Background technique [0002] The main component of coal desulfurization products is gypsum (CaSO 4 2H 2 O) or its mixture with calcium sulfite, and a certain amount of fly ash. Among them, calcium sulfate (gypsum) is a common building material, while calcium sulfite is waste, and because it is unstable, it is very easy to cause secondary pollution to the environment. In fact, since my country is a country rich in gypsum, and the gypsum produced after desulfurization contains a lot of impurities such as water and ash, it cannot be used directly as a building material, and must be further purified and dehydrated before it can be used. As a result, it loses its competitiveness in the market and thus it is also usually discarded as waste. At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02
Inventor 陈昌和徐旭常乌力更王淑娟李跃进李彦
Owner TSINGHUA UNIV
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