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Special biochar-based organic and inorganic composite fertilizer for acidic soil and preparation method thereof

An acid soil, biochar technology, applied in the application, fertilization device, fertilizer mixture and other directions, can solve the problems of not considering biochar, the effect of adsorption materials is very different, neglected, etc., and achieves a simple and easy preparation method, good effect, and improved pellets. effect of structure

Active Publication Date: 2014-12-17
SOUTH CHINA AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, biochars with different raw materials and preparation conditions have great differences in pH value, porosity, specific surface area, special functional group structure, etc., and the differences also lead to different effects as adsorption materials.
On the one hand, the relevant technical products currently applied for ignore the specific characteristics of biochar and whether the basic properties of the soil in the application area are appropriate; Some special properties require a specific process to maximize strengths and circumvent weaknesses in order to obtain good results

Method used

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  • Special biochar-based organic and inorganic composite fertilizer for acidic soil and preparation method thereof
  • Special biochar-based organic and inorganic composite fertilizer for acidic soil and preparation method thereof

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preparation example Construction

[0038] The present invention also provides a preparation method of biochar-based organic-inorganic compound fertilizer special for acidic soil, comprising the following steps:

[0039] Mixing the biochar with the acidity adjusting substance to obtain a first mixture with a water content of 40-50%, after standing at room temperature for 22-26 hours, drying to a water content of 23-27%, to obtain a second mixture ;

[0040] Mix the nitrogen-containing substance, phosphorus-containing substance, potassium-containing substance, mineral powder and attapulgite powder with the second mixture, granulate, and dry to obtain the biochar-based organic-inorganic compound fertilizer for acidic soil ;

[0041] Wherein, the sodium silicate is sprayed during the granulation process.

[0042] In the past, it was the inherent mode of using biochar directly or using measures such as pickling and water washing. In the present invention, an appropriate amount of humic acid is introduced, and the ...

Embodiment 1

[0048] Crush peanut shells and bagasse to a diameter of ≤2.5 cm, anaerobically crack them at 450°C for 2 hours, pass through a 200-mesh sieve after crushing, and use biochar made from peanut shells, bagasse, and corn stalks in a weight ratio of 1:1:1.5 mixed evenly;

[0049] Mix the mixed biochar with pH 3.8 and humic acid passing through a 200-mesh sieve at a weight ratio of 19:1, adjust the water content to 50%, leave it at room temperature for 24 hours, and then dry it until the water content is 25%. Two mixtures;

[0050] Mix the second mixture, urea, monoammonium phosphate, potassium chloride, attapulgite powder, and limestone powder in a weight ratio of 18:32:15:20:9:6, and then perform disc granulation. The sodium silicate solution with a concentration of 0.2% is sprayed, dried until the water content is below 12%, and the special biochar-based organic-inorganic compound fertilizer for acidic soil is obtained.

[0051] The compound fertilizer has a pH of 7.02, a parti...

Embodiment 2

[0057] Peanut shells, bagasse, and corn stalks were crushed to a diameter of ≤ 2.5 cm, anaerobically cracked at 480°C for 2.5 hours, and passed through a 300-mesh sieve after crushing, and the biochar prepared from peanut shells, bagasse, and corn stalks was The weight ratio is 1:1:2 and mixed evenly;

[0058] Mix biochar and humic acid with a pH of 4 and pass through a 200-mesh sieve at a weight ratio of 19:1, adjust the water content to 40%, leave it at room temperature for 26 hours, and then dry it until the water content is 23%, which is the second mixture;

[0059] Mix the second mixture, urea, diammonium phosphate, potassium chloride, and attapulgite powder at a weight ratio of 33:25:10:15:17, and then extrude and granulate. The uniform spraying concentration during the granulation process is 0.2% The sodium silicate solution is dried until the water content is below 12%, and the special biochar-based organic-inorganic compound fertilizer for acidic soil is obtained.

...

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Abstract

The invention relates to the field of fertilizers for acidic soil and particularly relates to a special biochar-based organic and inorganic composite fertilizer for acidic soil and a preparation method thereof. The special biochar-based organic and inorganic composite fertilizer for the acidic soil is prepared from the following raw materials: biochar, an acidity regulating substance, a nitrogen-containing substance, a phosphorus-containing substance, a potassium-containing substance, mineral powder and a granulation binder, wherein the granulation binder comprises attapulgite powder and sodium silicate. The composite fertilizer is prepared by mixing the biochar as a controlled-release material and an adsorption material with other components according to a certain proportion, the matching of the components is reasonable, and the nutritional requirements of growth of crops can be well met; the sustained-release effect is good, and the composite fertilizer only needs to be applied once; the composite fertilizer has the effects of improving the pH value of the soil, improving the content of a carbon pool in soil, improving the aggregate structure and the porosity of the soil and reducing toxicity of heavy metals and organic pollutants and can achieve the effects of saving labor, saving the fertilizer and improving the yield and the quality of agricultural products. The invention further provides the preparation method of the composite fertilizer. The preparation method is simple and feasible.

Description

technical field [0001] The invention relates to the field of fertilizers for acidic soils, in particular to a special biochar-based organic-inorganic compound fertilizer for acidic soils and a preparation method thereof. Background technique [0002] Red soil, crimson red soil, and brick red soil are the main soil types in southern my country. This type of soil is mainly acidic, and the pH of most soils is between 4.5 and 6.0. With the massive application of chemical fertilizers and the unreasonable combination of organic and inorganic fertilizers in recent years, soil acidification tends to aggravate gradually, and has seriously affected land productivity in a local area. The decline in soil microbial diversity, unreasonable community structure, and increased toxicity of heavy metals caused by soil acidification have all exacerbated the deterioration of the ecological environment and increased the hidden dangers of food safety to a certain extent. Studies have shown that t...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/00C05G3/80
Inventor 逄玉万唐拴虎杨少海徐培智张发宝黄旭易琼黄巧义李苹付弘婷
Owner SOUTH CHINA AGRI UNIV
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