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Special charcoal-based slow release compound fertilizer for tobaccos and preparation method of compound fertilizer

A technology of slow-release compound fertilizer and biochar, applied in application, fertilization equipment, fertilizer mixture, etc., can solve the problems of ineffective control of nutrient release rate, poor soil quality of cultivated land, and decline of soil organic matter, so as to achieve a virtuous cycle , Improve physical and chemical properties and microbial activity, and delay the effect of nutrient release

Active Publication Date: 2014-07-09
HENAN AGRICULTURAL UNIVERSITY
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the soil quality of cultivated land in China is generally not optimistic. The main problems are: the basic fertility of cultivated land is declining, the soil is barren, the distribution of nutrients is uneven, and the soil is seriously degraded; km 2 , 2.16 million km of acidic soil 2 , accounting for 21% of the country's land area; it also includes the decline of soil organic matter, loose structure, and soil failure
[0005] At present, a series of compound fertilizers with slow-release function have been developed internationally to improve the utilization efficiency of fertilizer nutrients, but these fertilizers have high raw material costs and complicated processes, which are not conducive to large-scale promotion and application, and most of them contain polymers. The main coating materials, most of which cannot be completely degraded, are easy to accumulate in the soil and form "secondary pollution"
Due to the large amount of water and frequent irrigation in tobacco fields, the coating material is easy to dissolve in water, and it is difficult to protect the nutrients of fertilizers, and the effect of controlling the release rate of nutrients is not obvious. Therefore, it is low-cost and suitable for tobacco fields. The environmentally friendly slow-release nitrogen fertilizer has become an urgent demand in production

Method used

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  • Special charcoal-based slow release compound fertilizer for tobaccos and preparation method of compound fertilizer
  • Special charcoal-based slow release compound fertilizer for tobaccos and preparation method of compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation test of tobacco stalk biochar

[0027] The effect of biochar under different carbonization conditions on soil fertility is quite different. This experiment is to study the best carbonization conditions of tobacco stalks as biochar. Through experimental comparison, the data analysis of different temperature biochar was carried out to determine the carbonization conditions.

[0028] Select some dry tobacco stalks from the tobacco leaf production area, weigh a certain weight, put them in the muffle furnace for pyrolysis and carbonization, the heating rate is 20°C per minute, after reaching the set pyrolysis temperature, carbonize for 2 hours, and then turn off the muffle furnace. Furnace power supply, natural cooling to room temperature, take out the samples, before testing, the samples are uniformly placed in a sealed bag, and shelved in a cool place. Set the temperature to eight pyrolysis temperatures of 100°C, 200°C, 300°C, 400°C, 500°C, 600°C, 7...

Embodiment 2

[0034] Example 2 A preparation method for tobacco-specific biochar-based slow-release compound fertilizer, comprising the steps of:

[0035] (1) Pyrolyze the dried tobacco stalks in an anoxic environment at 400°C to produce biochar, cool it, and crush it through a 0.5-2mm sieve;

[0036] (2) After soaking the biochar obtained in the previous step with clean water for 5 hours, rinse it twice with clean water, and dry it for later use;

[0037](3) Take 50 parts of the tobacco stalk biomass charcoal, NPK ternary compound fertilizer (the basic fertilizer prepared includes ammonium nitrate, potassium nitrate, potassium sulfate, monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate) 50 parts 2 parts, 2 parts of calcium lignosulfonate after stirring, drying and granulating, it is ready.

[0038] Taking the nitrogen element in the above-mentioned tobacco-specific biochar-based slow-release compound fertilizer as an example, and testing according to convention...

Embodiment 3

[0039] Example 3 A method for preparing tobacco-specific biochar-based slow-release compound fertilizer is basically the same as in Example 2, except that when preparing tobacco stalk biochar, the obtained biochar is activated as follows: at 900°C In an oxygen-free environment, water vapor was introduced at a flow rate of 0.31L / min, and the activation treatment was performed for 90 minutes.

[0040] Taking nitrogen as an example, according to the conventional test method, the 24-hour initial nitrogen nutrient release rate of the above-mentioned tobacco-specific biochar-based slow-release compound fertilizer was 6.91%; the 28-day cumulative nutrient release rate was 23.20%; The nutrient release rate was 34.21%, the cumulative nutrient release rate was 81.10% in the 18th week, and the nutrient release lasted for 210 days, which was 8% to 13% lower than the nutrient release rate of ordinary nitrogen fertilizers, and the release period was extended by 30 to 50 days; and its nutri...

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Abstract

The invention relates to a special charcoal-based slow release compound fertilizer for tobaccos and a preparation method of the compound fertilizer, and aims at overcoming the technical difficulty of overquick nutrient release of an existing fertilizer. The slow release fertilizer is prepared by performing processes of stirring, drying, granulating and the like on tobacco stalk biomass charcoal, a nitrogen phosphorus and potassium three-component compound fertilizer and the like as raw materials. The slow release fertilizer has the effects and the potentials of improving the physical and chemical properties and the microbial activity of tobacco field soil and increasing the carbon sequestration potential of the soil, and can add soil organic matters, increase the cation exchange capacity of the soil, add granular structures, prevent soil hardening and improve the hydrothermal condition of the soil; the tobacco stalk biomass charcoal can delay the nutrient release of the fertilizer in the tobacco field soil, match the fertilizer nutrient release with a fertilizer demand rule of tobacco stalks, reduce the nutrient loss and increase the utilization rate of the fertilizer; the used raw materials are wide in source, low in price and easily available, the production cost is low, and the ecological high-valued utilization of agricultural wastes is facilitated; in addition, the preparation method of the compound fertilizer is easy, convenient to operate and favorable for large-range popularization.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a special biochar-based slow-release compound fertilizer for tobacco and a preparation method thereof. Background technique [0002] At present, the soil quality of cultivated land in China is generally not optimistic. The main problems are: the basic fertility of cultivated land is declining, the soil is barren, the distribution of nutrients is uneven, and the soil is seriously degraded; km 2 , 2.16 million km of acidic soil 2 , accounting for 21% of the country's land area; it also includes the decline of soil organic matter, loose structure, and soil failure. In order to solve the situation of single soil structure and poor nutrients, it has directly led to the widespread phenomenon of excessive fertilization in our country, the obvious reduction of nutrient utilization rate, and caused a series of food safety and environmental problems. [0003] Similar problems also exist in to...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 叶协锋于晓娜王勇胡战军徐敏朱晓伟汤术开曲平志张要旭刘迎昌吴树成欧聪敏
Owner HENAN AGRICULTURAL UNIVERSITY
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