CN104211545B - A kind of acid ground special bio charcoal base compound organic and inorganic fertilizer and preparation method thereof - Google Patents

Abstract

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. Biochar-based organic-inorganic compound fertilizer for acidic soil, made of the following raw materials: biochar, acidity regulating substances, nitrogen-containing substances, phosphorus-containing substances, potassium-containing substances, mineral powder, granulation binder; granulation binder The agent is attapulgite powder and sodium silicate. The compound fertilizer uses biochar as the controlled-release material and adsorption material, and is mixed with other ingredients in a certain proportion. The ingredients are well matched to meet the nutritional needs of crop growth; Yes; it has the effects of increasing soil pH, increasing soil carbon pool capacity, improving soil aggregate structure and porosity, reducing the toxicity of heavy metals and organic pollutants, saving labor and fertilizer, and improving the output and quality of agricultural products. The invention also provides a preparation method of the compound fertilizer, which is simple and feasible.

Description

Biochar-based organic-inorganic compound fertilizer special for acidic soil and preparation method thereof

technical field

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

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 the effective way to improve the quality of cultivated land without affecting the crop yield is the combined application of organic and inorganic compound fertilizers. At present, due to the uneven quality of organic fertilizers in the market, the lack of enthusiasm of farmers, and the unreasonable application ratio, there is still a huge space for organic fertilizers to be returned to the field.

Biochar refers to a stable carbon source with a porous structure and specific functional groups formed by pyrolysis of biomass under anaerobic conditions. Compared with ordinary biomass, biochar has the characteristics of good adsorption performance, strong water and fertilizer retention capacity, and slow mineralization rate in soil. Even so, due to its high energy consumption, the market prospect of returning biochar directly to the field is still not promising. Therefore, expanding the use of biochar in fertilizer is of great value to the promotion of biochar technology. Organic-inorganic combined fertilizer science has been one of the hotspots at home and abroad in recent years, and related patents and articles have been published based on biochar-based organic-inorganic compound fertilizers. However, there are great differences in the pH value, porosity, specific surface area, and special functional group structure of biochar with different raw materials and preparation conditions, which 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 specific techniques to maximize strengths and circumvent weaknesses in order to obtain good results.

Contents of the invention

The object of the present invention is to provide a special biochar-based organic-inorganic compound fertilizer for acidic soil and its preparation method to solve the above problems.

In the embodiment of the present invention, a special biochar-based organic-inorganic compound fertilizer for acidic soil is provided, which is made of the following raw materials: biochar, acidity regulating substances, nitrogen-containing substances, phosphorus-containing substances, potassium-containing substances, mineral powder , granulation binder;

The granulation binder is attapulgite powder and sodium silicate;

Wherein, the mass ratio of the biochar, the acidity regulating substance, the nitrogen-containing substance, the phosphorus-containing substance, the potassium-containing substance, the mineral powder and the attapulgite powder is 17-33:0.9 -1.7:20-32:7-15:15-20:0-10:9-17.

Preferably, the mass of the biochar, the acidity regulating substance, the nitrogen-containing substance, the phosphorus-containing substance, the potassium-containing substance, the mineral powder, the attapulgite powder and the sodium silicate The ratio is 20-30:1-1.5:25-30:10-15:18-20:6-10:15-17.

Preferably, the biochar is made from two or more raw materials of peanut shells, banana stalks, bagasse and corn stalks.

Preferably, the biochar has a specific surface area of 15-35m ² /g, a pH value of 8.5-9.0, and a carbon content of 930-970g/kg.

Preferably, the biochar is prepared by the following method:

The raw material of biochar is cut into a diameter not larger than 2.5cm, and then cracked at 450-500°C for 2-3 hours under anaerobic conditions.

Preferably, after the biochar is made, it is pulverized and passed through a sieve with a mesh size of 200 or more to obtain a finished product.

Preferably, the acidity adjusting substance is humic acid, the pH of the humic acid is 3.8-4.0, and the particle size is greater than 200 mesh.

Preferably, the nitrogen-containing substance is urea; the phosphorus-containing substance is monoammonium phosphate or diammonium phosphate; and the potassium-containing substance is potassium sulfate or potassium chloride.

Preferably, the mineral powder is zeolite powder or limestone powder; the particle size of the mineral powder is greater than 200 mesh.

Preferably, the biochar-based organic-inorganic compound fertilizer for acidic soil has a particle size of 3.5-5.5 mm and a pH value of 7.0-8.0.

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

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 ;

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 ;

Wherein, the sodium silicate is sprayed during the granulation process.

Preferably, the drying is drying until the water content is below 12%.

A special biochar-based organic-inorganic compound fertilizer for acidic soils provided by the embodiments of the present invention uses biochar as a controlled-release material and adsorption material, and is mixed with acidity regulating substances, nitrogen-containing substances, phosphorus-containing substances, potassium-containing substances, and mineral powders. The organic-inorganic compound fertilizer prepared by mixing with granulation binder and granulation binder is reasonable in composition, which can well meet the nutritional needs of crop growth; the slow-release effect is good, and it can be applied at one time. It has both organic and inorganic functions. The application will neither cause seedling burning in the early stage, nor will it cause problems such as defertilization in the later stage; and it has the effect of increasing soil pH, increasing soil carbon storage capacity, improving soil aggregate structure, porosity, and reducing the toxicity of heavy metals and organic pollutants. It improves the acidic soil, improves the root environment of crops, and enhances the absorption of nutrients by the root system, so as to save labor and fertilizer, and improve the yield and quality of agricultural products. The invention also provides a preparation method of the biochar-based organic-inorganic compound fertilizer special for acidic soil. The preparation method is simple and easy, and the prepared biochar-based organic-inorganic compound fertilizer special for acidic soil has good effect after application.

detailed description

The present invention will be further described in detail through specific implementation examples below.

In the embodiment of the present invention, a special biochar-based organic-inorganic compound fertilizer for acidic soil is provided, which is made of the following raw materials: biochar, acidity regulating substances, nitrogen-containing substances, phosphorus-containing substances, potassium-containing substances, mineral powder , granulation binder;

The granulation binder is attapulgite powder and sodium silicate;

Wherein, the mass ratio of the biochar, the acidity regulating substance, the nitrogen-containing substance, the phosphorus-containing substance, the potassium-containing substance, the mineral powder and the attapulgite powder is 17-33:0.9 -1.7:20-32:7-15:15-20:0-10:9-17.

A special biochar-based organic-inorganic compound fertilizer for acidic soils provided by the embodiments of the present invention uses biochar as a controlled-release material and adsorption material, and is mixed with acidity regulating substances, nitrogen-containing substances, phosphorus-containing substances, potassium-containing substances, and mineral powders. The organic-inorganic compound fertilizer prepared by mixing with granulation binder and granulation binder is reasonable in composition, which can well meet the nutritional needs of crop growth; the slow-release effect is good, and it can be applied at one time. It has both organic and inorganic functions. The application will neither cause seedling burning in the early stage, nor will it cause problems such as defertilization in the later stage; and it has the effect of increasing soil pH, increasing soil carbon storage capacity, improving soil aggregate structure, porosity, and reducing the toxicity of heavy metals and organic pollutants. It improves the acidic soil, improves the root environment of crops, and enhances the absorption of nutrients by the root system, so as to save labor and fertilizer, and improve the yield and quality of agricultural products. Wherein, the consumption of sodium silicate is conventional consumption.

In order to better improve the soil environment, its ratio is more in line with the nutritional needs of crops, and the obtained compound fertilizer has a better slow-release effect, so as to have a better effect of saving labor and fertilizer, and improving the yield and quality of agricultural products. Preferably, the mass of the biochar, the acidity regulating substance, the nitrogen-containing substance, the phosphorus-containing substance, the potassium-containing substance, the mineral powder, the attapulgite powder and the sodium silicate The ratio is 20-30:1-1.5:25-30:10-15:18-20:6-10:15-17.

Preferably, the biochar is made from two or more raw materials of peanut shells, banana stalks, bagasse and corn stalks. Specific raw materials are selected to prepare biochar, and the prepared biochar satisfies the characterization of biochar as an acidic soil amendment in terms of pH value, porosity, specific surface area, and special functional group structure, and corrects the previous characterization of biochar. The misconception that the requirements for the properties of raw materials are not strict and only meet the preparation conditions is enough. This is an important breakthrough in the use of biochar in the field of fertilizers.

In order for the prepared biochar to better meet the characterization of biochar as an acidic soil amendment in terms of pH value, porosity, specific surface area, special functional group structure, etc., preferably, the specific surface area of the biochar is 15-35m ² /g, the pH value is 8.5-9.0, and the carbon content is 930-970g/kg. Specifically, the biochar is prepared by the following method: cutting the raw material of the biochar into a diameter not larger than 2.5 cm, and pyrolyzing it at 450-500° C. for 2-3 hours under anaerobic conditions. After multiple verifications, the raw materials are prepared according to this method and mixed in a certain proportion to obtain biochar. The range of parameters can reach: the specific surface area is 15-35m ² /g, the pH value is 8.5-9.0, and the carbon content is 930 -970g/kg.

In order to better mix the biochar with other raw materials and achieve a good slow-release effect, preferably, after the biochar is made, it is pulverized and passed through a sieve of more than 200 meshes to obtain a finished product.

The invention is based on high-quality biochar raw materials, which ensures the quality of organic raw materials from the source. At the same time, according to the quality requirements of organic-inorganic compound fertilizers and the characteristics of soil and crops in the southern region, the suitable biochar characterization was defined. While realizing the combined application of organic and inorganic compound fertilizers, it can achieve the effects of increasing soil pH, increasing soil carbon storage capacity, improving soil aggregate structure, porosity, and reducing the toxicity of heavy metals and organic pollutants. Therefore, this product has broad application prospects and plays a huge role in sustainable agricultural production in southern my country.

Humic acid can be separated from metal ions in water, which is conducive to the transfer of nutrients to crops, and can improve the soil structure, which is beneficial to the growth of crops. Preferably, the acidity adjusting substance is humic acid, the pH of the humic acid is 3.8-4.0, and the particle size is greater than 200 mesh. A pH of 3.8-4.0 is easier to achieve acid-base balance and nutrient chelation with biochar; humic acid with this particle size can be better mixed with other ingredients to achieve good adsorption and slow release.

Urea is a neutral fertilizer, suitable for various soils and plants; it is easy to store, easy to use, and has little damage to the soil; monoammonium phosphate or diammonium phosphate is a good supplement of phosphorus to meet the needs of crop growth Potassium sulfate or potassium chloride is the main component of common potash fertilizers, which can supplement potassium well. Preferably, the nitrogen-containing substance is urea; the phosphorus-containing substance is monoammonium phosphate or diammonium phosphate; and the potassium-containing substance is potassium sulfate or potassium chloride.

Preferably, the mineral powder is zeolite powder or limestone powder; the particle size of the mineral powder is greater than 200 mesh. Limestone powder and zeolite powder have good adsorption, so that the obtained compound fertilizer has better adsorption and better slow-release effect.

Preferably, the biochar-based organic-inorganic compound fertilizer for acidic soil has a particle size of 3.5-5.5 mm and a pH value of 7.0-8.0. The compound fertilizer with the granularity and pH is easy to fertilize evenly and has good slow-release effect.

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

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 ;

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 ;

Wherein, the sodium silicate is sprayed during the granulation process.

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 acid-base balance and nutrient chelation of the two are achieved by mixing biochar and humic acid; a breakthrough Eliminate the utilization bottleneck of unqualified fertilizer acidity due to the strong alkalinity of biochar.

Biochar mixed with humic acid is not completely dried before granulation, which on the one hand ensures the stability of the denaturation effect in the early stage; on the other hand, reduces the production cost of thorough drying and secondary granulation water spraying.

In combination with the fertilizer detection method, the invention fully considers the phosphorus and potassium components contained in the biochar. When calculating the fertilizer nutrient formula in production, the amount of phosphate fertilizer and potassium fertilizer can be calculated up to the critical point, and there is no need to deliberately add raw materials to worry about the total nutrient content not reaching the standard as in traditional fertilizer production.

Preferably, the drying is drying until the water content is below 12%. The compound fertilizer with this water content is easy to store and convenient to fertilize.

A special biochar-based organic-inorganic compound fertilizer for acidic soils provided by the embodiments of the present invention uses biochar as a controlled-release material and adsorption material, and is mixed with acidity regulating substances, nitrogen-containing substances, phosphorus-containing substances, potassium-containing substances, and mineral powders. The organic-inorganic compound fertilizer prepared by mixing with granulation binder and granulation binder is reasonable in composition, which can well meet the nutritional needs of crop growth; the slow-release effect is good, and it can be applied at one time. It has both organic and inorganic functions. The application will neither cause seedling burning in the early stage, nor will it cause problems such as defertilization in the later stage; and it has the effect of increasing soil pH, increasing soil carbon storage capacity, improving soil aggregate structure, porosity, and reducing the toxicity of heavy metals and organic pollutants. It improves the acidic soil, improves the root environment of crops, and enhances the absorption of nutrients by the root system, so as to save labor and fertilizer, and improve the yield and quality of agricultural products. The invention also provides a preparation method of the biochar-based organic-inorganic compound fertilizer special for acidic soil. The preparation method is simple and easy, and the prepared biochar-based organic-inorganic compound fertilizer special for acidic soil has good effect after application.

Example 1

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;

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;

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.

The compound fertilizer has a pH of 7.02, a particle size of 5.5mm, an organic matter content of 16%, and a nutrient ratio of nitrogen, phosphorus, and potassium: 17:7:12, and can be used for vegetables, One-time fertilization in the production of rice and sweet corn and sugarcane fertilization can achieve the effect of saving labor, increasing production and improving soil fertility.

This compound fertilizer test takes Chinese cabbage (the kind is oily green coarse moss) as the target crop, simultaneously with the same amount of organic fertilizer and compound fertilizer as contrast, the amount of nitrogen, phosphorus and potassium in the organic fertilizer and compound fertilizer is respectively according to 170, 70, 120 ( kg·hm ^-2 ). This product is used for one-time use. In the control treatment, the organic fertilizer is used as the base fertilizer for one time, and the compound fertilizer is used as the base fertilizer and topdressing fertilizer in a ratio of 6:4; the amount of fertilizer applied by this product and the control is 1000kg·hm ^-2 . The experiment was carried out for two consecutive seasons, and the results are shown in Table 1.

Table 1 Cabbage test results

As can be seen from Table 1: compared with the contrast, the special biochar-based organic-inorganic compound fertilizer for acidic soil provided by the invention has better effects on physical and chemical indicators such as soil organic matter, pH, CEC; C content and reducing nitrate content also have good performance.

Example 2

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;

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;

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.

The compound fertilizer has a pH of 7.88, a particle size of 4.5mm, an organic matter content of 30%, and a nutrient ratio of nitrogen, phosphorus, and potassium: 13:5:9. It can be used in strongly acidic soils in the south (4.0<pH<5.0) and has a low organic matter content. , The sloping land planted with eucalyptus, pine, tea, fruit trees, sugar cane, etc. with poor basic soil fertility has a good effect on increasing the organic matter, pH, CEC, etc. of acidic soil; it increases the yield, saves labor, increases production, and improves soil fertility. Effect.

Example 3

Peanut shells, banana stalks, and corn stalks were crushed to a diameter of ≤ 2.5 cm, anaerobically cracked at 500°C for 2.5 hours, and then passed through a 250-mesh sieve after crushing, and the biochar prepared from peanut shells, banana stalks, and corn stalks was The weight ratio is 1:0.8:1.2 and mixed evenly;

Mix biochar and humic acid with a pH of 3.8 and pass through a 200-mesh sieve at a weight ratio of 19:1, adjust the water content to 45%, leave it at room temperature for 24 hours, and then dry it until the water content is 25%, which is the second mixture;

Mix the second mixture, urea, monoammonium phosphate, potassium sulfate, attapulgite powder (passed through a 200-mesh sieve), and zeolite powder (passed through a 200-mesh sieve) in a weight ratio of 30:20:7:18:15:10. Carry out extrusion granulation, evenly spray 0.2% sodium silicate solution in the granulation process, and dry until the water content is below 12%, to obtain the special biochar-based organic-inorganic compound fertilizer for acidic soil.

The compound fertilizer has a pH of 7.6, a particle size of 5mm, an organic matter content of 27%, and a nutrient ratio of nitrogen, phosphorus, and potassium: 10:3:9; it can be used in strongly acidic soils in the south (4.0<pH<5.0), with high soil fertility, Old vegetable plots, banana orchards, fruit trees, peanuts, winter potatoes, etc. with severe hardening.

This compound fertilizer test takes mustard (the kind is Hong Kong bamboo mustard) as the target crop, and simultaneously with the same amount of organic fertilizer and compound fertilizer as contrast, the amount of nitrogen, phosphorus and potassium in the organic fertilizer and compound fertilizer is according to 150, 45, 135 (kg. hm ^-2 ). This product is used for one time. In the control treatment, the organic fertilizer is used as the base fertilizer for one time, and the compound fertilizer is used as the base fertilizer and the top dressing according to the ratio of 6:4; the amount of fertilizer applied by this product and the control is 1500kg·hm ^-2 . The test results for two consecutive seasons are shown in Table 2.

Table 2 mustard test results

As can be seen from Table 2, compared with the contrast, the special biochar-based organic-inorganic compound fertilizer for acidic soil provided by the invention has better effects on improving acidic soil organic matter, pH, CEC, etc.; Content, soluble sugar content also has a good effect.

Example 4

Peanut shells, banana stalks, and corn stalks were crushed to a diameter of ≤ 2.5 cm, anaerobically cracked at 500°C for 2.5 hours, and then passed through a 400-mesh sieve after crushing, and the biochar prepared from peanut shells, banana stalks, and corn stalks was The weight ratio is 1:1.2:1 and mixed evenly;

Mix biochar and humic acid with a pH of 4.0 and passed through a 200-mesh sieve at a weight ratio of 19:1, adjust the water content to 45%, leave it at room temperature for 22 hours, and then dry it until the water content is 27%, which is the second mixture;

Mix the second mixture, urea, monoammonium phosphate, potassium chloride, attapulgite powder (through a 200-mesh sieve), and limestone powder (through a 200-mesh sieve) in a weight ratio of 34:22:12:15:17:10 and mix evenly Afterwards, extrusion granulation is carried out. During the granulation process, a sodium silicate solution with a concentration of 0.2% is evenly sprayed, and dried until the water content is below 12%. The biochar-based organic-inorganic compound fertilizer for acidic soil is obtained.

The compound fertilizer has a pH of 8.0, a particle size of 3.5mm, an organic matter content of 30%, and a nutrient ratio of nitrogen, phosphorus, and potassium: 12:6:9; it can be used in severely acidic soils in the south (pH<4.0), such as basic soil fertility levels. Pioneering land, slope land, etc., are used to plant eucalyptus, pine, tea tree, camellia oleifera, fruit trees, sugar cane, etc., which have a good effect on improving acidic soil organic matter, pH, CEC, etc., so as to improve soil pH and fertility, and can improve output, to achieve the effect of saving labor and increasing production.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. an acid ground special bio charcoal base compound organic and inorganic fertilizer, its feature existsIn, made by following raw material: charcoal, acidity adjustment material, nitrogen substance, phosphorous thingMatter, containing potassium material, mineral powder, adhesive for granulating;

Described adhesive for granulating is concave convex rod stone flour and sodium metasilicate;

Wherein, described charcoal, described acidity adjustment material, described nitrogen substance, described inPhosphorus containg substances, the described mass ratio containing potassium material, described mineral powder and described concave convex rod stone flourFor 20-30:1-1.5:25-30:10-15:18-20:6-10:15-17;

Described charcoal by two kinds in peanut shell, banana stalks, bagasse, maize straw withUpper raw material is made;

The specific area of described charcoal is 15-35m²/ g, pH value is 8.5-9.0, carbon contentFor 930-970g/kg;

Described acid ground special bio charcoal base compound organic and inorganic fertilizer is made by the following methodStandby:

Described charcoal is mixed with described acidity adjustment material, and making water content is 40-50%The first mixture, room temperature was placed after 22-26 hour, dry to water content be 23-27%,Obtain the second mixture;

By described nitrogen substance, phosphorus containg substances, containing potassium material, mineral powder and concave convex rod stone flourMix with described the second mixture, granulation, dries and obtains described acid ground special bio charcoalBase compound organic and inorganic fertilizer;

Wherein, in granulation process, spray described sodium metasilicate.

2. acid ground special bio charcoal base organic and inorganic compound according to claim 1Mixed fertile, it is characterized in that, described charcoal is prepared by following methods:

The raw material of charcoal is cut into diameter and be not more than 2.5cm, 450-500 DEG C under anoxybioticCracking 2-3 hour and make.

3. acid ground special bio charcoal base organic and inorganic compound according to claim 1Mixed fertile, it is characterized in that, described acidity adjustment material is humic acid, the pH of described humic acidFor 3.8-4.0, granularity is greater than 200 orders.

4. acid ground special bio charcoal base organic and inorganic compound according to claim 1Mixed fertile, it is characterized in that, described nitrogen substance is urea; Described phosphorus containg substances is phosphoric acid oneAmmonium or Diammonium phosphate (DAP); Described is potassium sulfate or potassium chloride containing potassium material.

5. acid ground special bio charcoal base organic and inorganic compound according to claim 1Mixed fertile, it is characterized in that, described mineral powder is zeolite powder or agstone; Described mineral powderGranularity be greater than 200 orders.

6. acid ground special bio charcoal base organic and inorganic compound according to claim 1Mixed fertile, it is characterized in that, described acid ground special bio charcoal base compound organic and inorganic fertilizerGranularity is 3.5-5.5mm, and pH value is 7.0-8.0.

7. the organic nothing of acid ground special bio charcoal base described in claim 1-6 any oneThe preparation method of machine Chemical Mixed Fertilizer, is characterized in that, comprises the following steps:

Described charcoal is mixed with described acidity adjustment material, and making water content is 40-50%The first mixture, room temperature was placed after 22-26 hour, dry to water content be 23-27%,Obtain the second mixture;

By described nitrogen substance, phosphorus containg substances, containing potassium material, mineral powder and concave convex rod stone flourMix with described the second mixture, granulation, dries and obtains described acid ground special bio charcoalBase compound organic and inorganic fertilizer;

Wherein, in granulation process, spray described sodium metasilicate.

8. acid ground special bio charcoal base organic and inorganic compound according to claim 7Mixed fertile preparation method, is characterized in that, described oven dry for dry to water content be 12% withUnder.