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A kind of controllable slow-release fertilizer and preparation method thereof

A slow-release fertilizer and soluble technology, applied in the field of controlled-release fertilizer, can solve the problems of fertilizer efficiency waste, plant damage, etc., and achieve the effect of good water retention and prolonging the fertilizer release cycle.

Active Publication Date: 2020-11-24
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vegetables and fruits such as peanuts, potatoes, watermelons, and strawberries are suitable for growing in acidic soils (pH=below 6). If the urea is too high, it will not only cause harm to plants due to high nitrogen concentration, but also cause waste of fertilizer efficiency.

Method used

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  • A kind of controllable slow-release fertilizer and preparation method thereof
  • A kind of controllable slow-release fertilizer and preparation method thereof
  • A kind of controllable slow-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A controllable slow-release fertilizer, the preparation method of which comprises the following steps:

[0023] (1) Wrap a layer of soluble starch film on the surface of sodium hydroxide particles, the thickness of the starch film is 0.2 mm, to obtain the coated alkali, and the particle diameter of the coated alkali is 2 mm;

[0024] (2) Mix 40 parts by weight of isobutylidene biurea, 30 parts of bamboo charcoal powder, 5 parts of coated alkali, 40 parts of cement and 20 parts of water, mix and stir evenly, and granulate into spherical shape, bake at 40-70 ℃. Dried to obtain controllable slow-release fertilizer, and the particle diameter of the controllable slow-release fertilizer is 4 mm.

[0025] Wherein, in above-mentioned preparation method, the specific surface area of ​​bamboo charcoal powder is 300-320m 2 / Kg; cement is portland cement, its specific surface area is 380-420m 2 / Kg.

Embodiment 2

[0027] A controllable slow-release fertilizer, the preparation method of which comprises the following steps:

[0028] (1) Wrap a layer of soluble starch film on the surface of sodium hydroxide granules, the thickness of the starch film is 1 mm, to obtain the coated alkali, and the particle diameter of the coated alkali is 4 mm;

[0029] (2) Mix 70 parts by weight of isobutylidene biurea, 50 parts of bamboo charcoal powder, 10 parts of coated alkali, 70 parts of cement and 30 parts of water, mix and stir evenly, and granulate into spherical shape, bake at 40-70 ℃. Dried to obtain controllable slow-release fertilizer, and the particle diameter of the controllable slow-release fertilizer is 10 mm.

[0030] Wherein, in above-mentioned preparation method, the specific surface area of ​​bamboo charcoal powder is 300-320m 2 / Kg; cement is portland cement, its specific surface area is 380-420m 2 / Kg.

Embodiment 3

[0032] A controllable slow-release fertilizer, the preparation method of which comprises the following steps:

[0033] (1) Wrap a layer of soluble starch film on the surface of sodium hydroxide particles, the thickness of the starch film is 0.5mm, to obtain the coated alkali, and the particle diameter of the coated alkali is 3mm;

[0034] (2) Mix 55 parts by weight of isobutylidene biurea, 30 parts of bamboo charcoal powder, 8 parts of coated alkali, 55 parts of cement and 25 parts of water, mix and stir evenly, and granulate into spherical shape, bake at 40-70 ℃. Dried to obtain controllable slow-release fertilizer, and the particle diameter of the controllable slow-release fertilizer is 6 mm.

[0035] Wherein, in above-mentioned preparation method, the specific surface area of ​​bamboo charcoal powder is 300-320m 2 / Kg; cement is portland cement, its specific surface area is 380-420m 2 / Kg.

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Abstract

The invention provides a controllable slow-release fertilizer and a preparation method thereof. The preparation method comprises the following steps: (1) wrapping a layer of soluble starch film on the surface layer of sodium hydroxide particles to obtain film-coated base; (2) mixing 40-70 parts of isobutyl diurea, 30-50 parts of bamboo charcoal powder, 5-10 parts of film-coated base, 40-70 parts of cement and 20-30 parts of water, stirring uniformly, granulating into balls, and drying to obtain the controllable slow-release fertilizer. According to the controllable slow-release fertilizer obtained by the preparation method, the fertilizer releasing period of isobutyl diurea is controlled by controlling the film coating thickness of the film-coated base and controlling the release rate of the base, so that the release period is long and the fertilizer efficiency is lasting.

Description

technical field [0001] The invention belongs to the technical field of controlled-release fertilizers, and in particular relates to a controllable slow-release fertilizer and a preparation method thereof. Background technique [0002] Slow-release fertilizers are mainly slow-acting nitrogen fertilizers, also known as long-acting nitrogen fertilizers, which have very low solubility in water, but gradually decompose under the action of chemical reactions and microorganisms after being applied to the soil, releasing nitrogen slowly to meet the needs of plants during the entire growth period. Nitrogen demand, reduce the cost of post-dressing fertilizer, and reduce the loss caused by nitrogen leaching, volatilization and denitrification. Isobutylidene biurea is prepared from urea and isobutyraldehyde by condensation reaction in the presence of an acid catalyst, and has the property of slowly releasing nitrogen. Because of its low solubility (only one thousandth of urea), it chan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/40C05G5/12C04B28/04
CPCC04B28/04C04B2111/00758C05C11/00C05G3/00C05G5/12C04B22/062C04B24/383C04B24/124C04B14/022C05D3/00C05D9/00
Inventor 宫晨琛金鸣慧周竞平芦令超程新
Owner UNIV OF JINAN
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