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A kind of straw liquefaction liquid for improving soil and method for preparing and improving soil

A technology for improving soil and liquefaction solution, which is applied in the field of straw liquefaction solution and liquefaction solution preparation and soil improvement, which can solve the problems of reducing straw utilization rate, long fermentation time, loss of organic matter, etc., achieve short transportation radius and improve soil structure , the effect of reducing the harm

Active Publication Date: 2020-03-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fermentation method takes a long time; while the biochar fertilizer method not only loses a large amount of organic matter in the straw and reduces the utilization rate of the straw, but also because the biochar itself is alkaline, its use in saline-alkali soil will be limited

Method used

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Examples

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preparation example Construction

[0036] A method for preparing soil-improving straw liquefaction liquid, comprising the following steps:

[0037] A. Cut the straw to a length of 1-20cm;

[0038] B. Put the cut straw into the reactor, and add water according to the mass ratio of straw to water 1:10-1:50, the volume after adding water is not more than 1 / 2 of the volume of the reactor;

[0039] C. Close the feeding port of the reactor and start the heating device;

[0040] D. Heat the reactor to 200-320°C, and control the pressure inside the reactor at 10-15MPa;

[0041] E. Constant temperature for 0.1~2h;

[0042] F, close the reactor heating device;

[0043] G, open reactor cooling device, be cooled to room temperature;

[0044] H. Release the straw liquefaction liquid through the discharge port of the reactor;

[0045] I. Analyze and measure the pH value, N, P, K, and organic matter content of the straw liquefaction liquid;

[0046] J. Detect the pH value, N, P, K, and organic matter content of the unim...

Embodiment 1

[0052] Choose agricultural waste corn stalks as raw materials, cut 15g corn stalks to grow 20cm; put the cut corn stalks and 500g water into a closed reaction kettle to liquefy, control the temperature at 320°C, and control the pressure at 15MPa. The holding time is 0.5h. After cooling, straw liquefaction liquid is obtained;

[0053] The pH value of the straw liquefaction liquid was found to be 3.80 after analysis, and the contents of nitrogen, phosphorus, potassium and organic matter were 1948.0mg / kg, 422.4mg / kg, 52000.0mg / kg and 26.5g / kg respectively.

[0054] Stir and mix 200ml of corn straw liquefaction solution with 1kg of saline-alkali soil in central and western Jilin Province. The pH value of the improved saline-alkali soil changed from 8.65 to 6.72; the nitrogen content increased from 18.84mg / kg to 86.12mg / kg, phosphorus The content increased from 15.95mg / kg to 24.50mg / kg, and the potassium content increased from 136.80mg / kg to 1451.25mg / kg. The germination rate of w...

Embodiment 2

[0056] Choose agricultural waste corncobs as raw materials, cut 15g corncobs to grow 1cm; put the cut corncobs and 500g water into a closed reaction kettle for liquefaction, control the temperature at 260°C, the pressure at 13MPa, and the holding time for 0.1h , to obtain corn cob liquefaction liquid after cooling;

[0057] After analysis, the pH value of the liquid phase is 3.20, and the contents of nitrogen, phosphorus, potassium, and organic matter are 2280.0mg / kg, 420mg / kg, 21000.0mg / kg, and 27.4g / kg, respectively.

[0058] Taking every 100ml of corncob liquefaction solution to improve 1.5kg of saline-alkali soil in central and western Jilin Province as an example, the pH value of the improved saline-alkali soil changed from 8.25 to 7.33; the nitrogen content increased from 45.22mg / kg to 186.88mg / kg; Phosphorus content increased from 29.74mg / kg to 54.12mg / kg; Potassium content increased from 60.81mg / kg to 1431.25mg / kg, the germination rate of planted wheat was changed fro...

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Abstract

The invention relates to a soil-improving straw liquefaction solution and a method for preparing and improving soil. The straw is used as the main raw material without any catalyst, and the straw and water are liquefied at a certain mass ratio under a certain condition and a constant temperature. Then the straw liquefaction solution is mixed with the soil, and directly sprayed or drenched. The method of the present invention does not use any catalyst, and only uses water as the medium to liquefy the straw, which has the dual functions of improving soil pH and supplementing nutrients. Crops grow and yields increase. The straw liquefaction method is simple and widely applicable, which can greatly reduce the use of chemical fertilizers, reduce straw burning, and reduce environmental pollution caused by straw burning. Straw liquefaction can kill the harmful bacteria remaining in the straw, and reduce the harm of the harmful bacteria carried by the straw to the subsequent cultivation.

Description

technical field [0001] The invention relates to a liquefied liquid agent for soil improvement and an improvement method, in particular to a straw liquefied liquid for soil improvement and the preparation of the liquefied liquid and a method for improving soil. Background technique [0002] The world produces about 100-200 billion tons of crop straw every year, and our country produces more than 700 million tons of crop straw every year. At present, straw is mainly used in fertilizer, feed, energy, industrial raw materials and deep processing. However, there are still many problems in large-scale utilization of straw due to its light weight and large volume, which lead to high transportation costs and limitations in development technology. Due to the lack of mobilization of farmers' enthusiasm in terms of economic benefits, a large amount of straw was burned, which not only reduced the economic performance of straw, polluted the environment, but also caused local fires due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/80C05G5/20C05F11/00B09C1/08
CPCB09C1/08C05F11/00C05G3/80C05G5/20
Inventor 高岩屈兵兵崔学军李俊锋王洪艳
Owner JILIN UNIV
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