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Slow release fertilizer for inhibiting soil urease activity and preparation method

A technology of urease activity and slow-release fertilizer, which is applied to nitrogen, potassium, and phosphate fertilizers. It can solve problems such as high soil enzyme activity, excessive urea hydrolysis, and unsatisfactory fertilizer efficiency, so as to inhibit urease activity, reduce decomposition, and reduce production. cost effect

Inactive Publication Date: 2017-05-31
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, urea fertilizer must be hydrolyzed by soil gland enzymes before it can be absorbed and utilized by crops. However, the activity of soil enzymes is too high, which leads to excessive hydrolysis of urea, and the crops are poisoned or volatilized due to the increase of local nitrogen concentration.
[0004] At present, in order to overcome the loss caused by high soil urease activity, some people in foreign countries have attached great importance to the research of soil urease inhibitors in recent years. The commonly used ones, such as mercuric dichloride, trypsin, hydrogen aldehyde and benzene, etc., have high cost and low fertilizer efficiency. Ideal, but also pollutes the soil

Method used

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  • Slow release fertilizer for inhibiting soil urease activity and preparation method
  • Slow release fertilizer for inhibiting soil urease activity and preparation method
  • Slow release fertilizer for inhibiting soil urease activity and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Formula: urea 18kg, humus 3kg, potassium sulfate 16kg, urea phosphate 13kg, gossypol acetate 1kg, tung oil 1kg;

[0018] Preparation:

[0019] (1) Granule preparation: Pour humic acid and molten urea into the reaction kettle at a ratio of 1:6, add methylal solution at the same time, stir and mix well, the stirring speed is 30r / min, the reaction temperature is 50-55°C, and the recovery Methylal, to obtain humic acid-urea complex, then add potassium sulfate and urea phosphate, the stirring speed is 80r / min, and spray dry to obtain an insoluble solid compound, the air temperature of the spray tower is 160 °C, and the air temperature of the tower At 90°C, crush to 60-70 meshes to obtain the primary product.

[0020] (2) Coating: Put the first product into the coating machine, set the speed at 600r / min, and the temperature at 65-68°C, start the hot air blower to preheat the urea granules, then add tung oil to the surface of the tumbling urea granules, Until the particle su...

Embodiment 2

[0022] Formula: urea 36kg, humus 4kg, potassium sulfate 25kg, urea phosphate 18kg, gossypol acetate 3kg, tung oil 3kg;

[0023] Preparation:

[0024] (1) Granule preparation: Pour humic acid and molten urea into the reaction kettle at a ratio of 1:9, add methylal solution at the same time, stir and mix well, the stirring speed is 50r / min, the reaction temperature is 65-70°C, and the recovery Methylal, to obtain humic acid-urea complex, then add potassium sulfate and urea phosphate, the stirring speed is 120r / min, and spray dry to obtain an insoluble solid compound, the air temperature of the spray tower is 180°C, and the air temperature of the tower is 110 ° C, crushed to 60 ~ 70 mesh, that is, to obtain the primary product.

[0025] (2) Coating: Put the first product into the coating machine, set the speed at 700r / min, and the temperature at 72-75°C, start the hot air blower to preheat the urea granules, then add tung oil to the surface of the tumbling urea granules, Until ...

Embodiment 3

[0027] Formula: urea 28kg, humus 4kg, potassium sulfate 20kg, urea phosphate 15kg, gossypol acetate 2kg, tung oil 2kg;

[0028] Preparation:

[0029] (1) Granule preparation: Pour humic acid and molten urea into the reaction kettle at a ratio of 1:7, add methylal solution at the same time, stir and mix well, the stirring speed is 40r / min, the reaction temperature is 60-65°C, and recover Methylal, to obtain humic acid-urea complex, then add potassium sulfate and urea phosphate, the stirring speed is 100r / min, after spray drying, an insoluble solid compound is obtained, the air temperature of the spray tower is 170 ° C, and the air temperature of the tower is 100 ° C, crushed to 60 ~ 70 mesh, that is, to obtain the primary product.

[0030] (2) Coating: put the first product into the coating machine, set the speed at 650r / min, and the temperature at 68-72°C, start the hot air blower to preheat the urea granules, and then add tung oil to the surface of the tumbling urea granules...

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Abstract

The invention relates to the technical field of chemical engineering, in particular to a slow release fertilizer for inhibiting soil urease activity and a preparation method. Urea, humic acid, potassium sulfate, urea phosphate, gossypol acetate and tung oil serve as raw materials and are granulated and coated to prepare the slow release fertilizer. The slow release fertilizer has the advantages of high efficiency, low cost, no toxicity and no pollution.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a slow-release fertilizer for inhibiting soil urease activity and a preparation method thereof. Background technique [0002] Soil enzymes are highly catalytic biocatalysts. All biochemical processes in soil are carried out under the action of soil enzymes. As an important part of soil, soil enzymes have a good correlation with soil physical and chemical properties. , can reflect the direction and intensity of soil biochemical processes, and has an important impact on soil physical and chemical properties and fertility status. Knowing the strength of soil enzyme activity is helpful to judge the soil's fertilizer supply capacity, and the relationship between soil enzyme activity and soil fertility status Relationships have become a hot topic of research, but mainly in agriculture and forestry. [0003] However, urea fertilizer must be hydrolyzed by soil gland enzymes be...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/08C08H99/00C08H7/00C05G3/80C05G3/90
CPCC05B15/00C08H6/00C05G3/80C05G3/90C05G5/30C05C9/00C05C11/00C05D1/02C05F11/02Y02P20/129
Inventor 陈肖虎金会心赵平原刘利唐道文
Owner GUIZHOU UNIV
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