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Method for preparing biochar based slow release fertilizers by utilizing sorghum straws

A technology of sorghum straw and slow-release fertilizer, which is applied to substrate fertilizers, waste fuels, organic fertilizers, etc., can solve the problems of declining agricultural product quality, changing soil properties, increasing production costs, etc., and achieves low production costs, improved utilization, and improved The effect of agricultural product quality

Inactive Publication Date: 2015-02-18
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The loss of chemical fertilizers not only increases production costs, but also causes eutrophication of lakes, reservoirs, rivers and other water bodies, changes in soil properties, decline in productivity, and decline in the quality of agricultural products, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of biochar-based slow-release fertilizer

[0037] The raw materials of the biochar-based slow-release fertilizer include the following components by mass ratio:

[0038] Modified biochar 30, cow dung biogas residue (30 mesh) 30, chemical fertilizer 31, a mixed solution of hydroquinone and cepiryl in a mass ratio of 1:1 3, bentonite 6.

[0039] Among them, the chemical fertilizer is to mix urea, superphosphate and potassium sulfate in a mass ratio of 1:2:2.

[0040] The preparation method: mix the ingredients according to the above ratio, extrude and granulate in a mold, sieve the granulated material, put it in an oven for drying, and obtain the bio-carbon-based slow-release fertilizer after cooling.

[0041] 2. Preparation method of modified biochar:

[0042] (1) Crush the collected sorghum stalks through an 80-mesh sieve.

[0043] (2) Take 100g of the above crushed sorghum stalks, add 25ml of 1.0mol / L dilute hydrochloric acid, stir and mix evenly, sea...

Embodiment 2

[0048] 1. Preparation of biochar-based slow-release fertilizer

[0049] The raw materials of the biochar-based slow-release fertilizer include the following components by mass ratio:

[0050]Modified biochar 32, cow dung biogas residue (30 mesh) 30, chemical fertilizer 33, a mixed solution of hydroquinone and cepiryl in a mass ratio of 1:1 3, bentonite 6.

[0051] Among them, the chemical fertilizer is to mix urea, superphosphate and potassium sulfate in a mass ratio of 1:2:2.

[0052] The preparation method: mix the ingredients according to the above ratio, extrude and granulate in a mold, sieve the granulated material, put it in an oven for drying, and obtain the bio-carbon-based slow-release fertilizer after cooling.

[0053] 2. Preparation method of modified biochar:

[0054] (1) Crush the collected sorghum stalks through an 80-mesh sieve.

[0055] (2) Take 100g of the above crushed sorghum stalks, add 25ml of 1.0mol / L dilute hydrochloric acid, stir and mix evenly, seal...

Embodiment 3

[0060] 1. Preparation of biochar-based slow-release fertilizer

[0061] The raw materials of the biochar-based slow-release fertilizer include the following components by mass ratio:

[0062] Modified biochar 32, cow dung biogas residue (30 mesh) 27, chemical fertilizer 33, a mixed solution of hydroquinone and cepiryl in a mass ratio of 1:1, 3, bentonite 5.

[0063] Among them, the chemical fertilizer is to mix urea, superphosphate and potassium sulfate in a mass ratio of 1:2:2.

[0064] The preparation method: mix the ingredients according to the above ratio, extrude and granulate in a mold, sieve the granulated material, put it in an oven for drying, and obtain the bio-carbon-based slow-release fertilizer after cooling.

[0065] 2. Preparation method of modified biochar:

[0066] (1) Crush the collected sorghum stalks through an 80-mesh sieve.

[0067] (2) Take 100g of the above crushed sorghum stalks, add 25ml of 1.0mol / L dilute hydrochloric acid, stir and mix evenly, s...

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Abstract

The invention provides a method for preparing biochar based slow release fertilizers by utilizing sorghum straws. The method is characterized by taking the sorghum straws as raw materials to prepare modified biochar through anaerobic pyrolysis and then mixing the modified biochar with cow dung biogas residues, chemical fertilizers, urease inhibitors, nitrification inhibitors, and the like, thus preparing high-efficiency slow release fertilizers. The prepared slow release fertilizers are simple in production process, accessible in raw materials and low in production cost, can not only conduce to effectively increasing the use ratios of nitrogen, phosphorus and potassium and reducing nutrient loss but also conduce to improving the soil quality and the agricultural product quality, and are beneficial to benign development of agricultural ecosystems.

Description

technical field [0001] The invention relates to the technical field of biochar-based fertilizer preparation, in particular to a method for preparing biochar-based slow-release fertilizer with sorghum straw. Background technique [0002] According to statistics, the annual consumption of chemical fertilizers in my country has reached 42.14 million tons, with an average of 368 kg / hm 2 , and there is still an irrational structure in the application process of chemical fertilizers, and the utilization rate of chemical fertilizers is extremely low. According to data, the average utilization rate of nitrogen fertilizer in my country is only 30% to 40%, phosphate fertilizer is only 10% to 20%, and potassium fertilizer is only 35% to 50%. The loss of chemical fertilizers not only increases production costs, but also causes eutrophication of lakes, reservoirs, rivers and other water bodies, changes in soil properties, decline in productivity, and decline in the quality of agricultur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/08C05G3/80C05G3/90
CPCC01B32/05C05F3/00C05G3/90C05G5/40Y02A40/22Y02E50/30Y02P60/21
Inventor 夏红霞朱启红
Owner CHONGQING UNIV OF ARTS & SCI
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