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Method for extracting humic acid from straw and application of humic acid

A technology of humic acid and straw, applied in the direction of organic fertilizers, etc., can solve the problem of low biological activity of humic acid, achieve the effect of increasing the number of effective ears, increasing the extraction rate, and facilitating growth and reproduction

Active Publication Date: 2018-07-27
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of low biological activity of humic acid obtained by straw decomposition method in the prior art, thereby providing a method and application of extracting humic acid with high biological activity from straw, This method has mild decomposition conditions and relatively short decomposition time

Method used

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  • Method for extracting humic acid from straw and application of humic acid

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Experimental program
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Effect test

Embodiment 1

[0029] The method of extracting humic acid from rice straw: firstly crush 100kg of rice straw and adjust the water content to 60wt%, add 0.5kg of EM bacterial agent and mix well, adjust the mass ratio of C / N to 20 with urea, then add 2.5 kg of sepiolite powder, after fully mixing, the material was airtightly cultured for 40 days, ventilated once every 30 hours and fully turned evenly, each time ventilated for 20 minutes, during which the water content was adjusted to keep at about 60wt%.

[0030] Air-dry the decomposed product of straw and mix it completely, take 5 g of the solid decomposed product, add 15 mL of extractant, the concentration of sodium citrate in the extractant is 0.08 mol / L, and the concentration of NaOH is 0.1 mol / L , shake at 200r / min at 25°C for 12h, stand at 25°C for 16h, then add 4.5mL saturated sodium sulfate solution, filter, and the obtained filtrate is humic acid. The carbon content in humic acid was determined by TOC instrument.

Embodiment 2

[0032] The method of extracting humic acid from rice straw: firstly crush 100kg of rice straw and adjust the water content to 70wt%, add 1.5kg of EM bacterial agent and mix well, adjust the mass ratio of C / N to 30 with urea, and then add 0.1kg of sepiolite powder, fully mixed and cultured in airtight for 50 days, ventilated once every 20h and fully turned, ventilated for 30min each time, during which the water content was adjusted to keep at about 70wt%.

[0033] Dry the decomposed product of straw, take 5g of solid decomposed product, add 40mL extractant, the concentration of potassium tartrate in the extractant is 0.03mol / L, the concentration of KOH is 0.2mol / L, 300r / min Shake at 25°C for 8h, let stand at 25°C for 20h, then add 8mL saturated sodium sulfate solution, filter, and the obtained filtrate is humic acid. The carbon content in humic acid was determined by TOC instrument.

Embodiment 3

[0035] The method for extracting humic acid from rice straw: firstly crush 100kg of rice straw and adjust the water content to 65wt%, add 1kg of straw quality EM bacterial agent and mix well, adjust the mass ratio of C / N to 25 with urea, and then Add sepiolite powder accounting for 1.5kg of straw mass, mix well and culture the material in airtight for 45 days, ventilate once every 24h and turn it well, ventilate for 20min each time, adjust the water content to keep at about 65wt% during this period.

[0036]Air-dry the stalk decomposed product and mix it completely, take 5 g of the solid decomposed product, add 25 mL of extractant, the concentration of sodium oxalate in the extractant is 0.05 mol / L, and the concentration of NaOH is 0.15 mol / L, Shake at 150r / min at 25°C for 14h, stand at 25°C for 18h, then add 5mL of saturated sodium sulfate solution, filter, and the obtained filtrate is humic acid. The carbon content in humic acid was determined by TOC instrument.

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Abstract

The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a method for extracting humic acid from straw and an application of the humic acid. The method provided by the invention adopts the straw as a raw material, adopts sepiolite powder or sepiolite powder and bone meal as a straw transformation promoter, and selects an EM microbial agent for inoculation culture, a combination of the transformation promoter and the EM microbial agent can significantly shorten decomposing time of the straw, the used sepiolite powder can accelerate decomposition of the straw, and because the sepiolite powder has a large specific surface area and absorbs water to become soft when in contact with water, the sepiolite powder can provide a good place and environmentfor growth and reproduction of EM bacteria and improve the content of the high-biological-activity humic acid in the decomposed product. A humic acid extraction liquid provided by the invention is sprayed as a foliar fertilizer, and has an obvious promoting effect on growth, development and yield increasing of rice.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers, and in particular relates to a method and application for extracting humic acid from straw. Background technique [0002] my country is a large agricultural country, and the output of straw in the farmland is huge every year, but most of the straw is discarded at random or directly burned, resulting in waste of resources and environmental pollution, and the straw has not been reasonably and fully utilized. Studies have found that straw is rich in cellulose and crude protein, which can be converted into organic matter rich in humic acid after decomposition. The so-called "compost" comes from this. It uses various plant residues, such as Crop stalks, weeds, leaves, peat, garbage, etc. are the main raw materials, mixed with human and livestock manure and urine, and composted and decomposed to form an organic fertilizer. It has the advantages of rich nutrients, long and stable fertil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C05F11/02
CPCC05F11/02C08H6/00
Inventor 张杰刘佳金志农李凤吕雄伟张海燕
Owner NANCHANG INST OF TECH
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