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Slow-release fertilizer for saline-alkali land and preparation method thereof

A saline-alkali land and slow-release fertilizer technology, which is applied in nitrogen fertilizer, fertilization equipment, organic fertilizer, etc., can solve the problems of difficult release of isobutylidene diurea fertilizer and difficult growth of crops

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, in areas with severe salinization, such as Northwest my country, it is difficult for crops to grow, and alkaline soil will inhibit the hydrolysis of isobutylidene diurea, making it difficult to release the fertilizer effect of isobutylidene diurea

Method used

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  • Slow-release fertilizer for saline-alkali land and preparation method thereof
  • Slow-release fertilizer for saline-alkali land and preparation method thereof
  • Slow-release fertilizer for saline-alkali land and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A slow-release fertilizer for saline-alkali land, the preparation method of which comprises the following steps:

[0022] (1) Wrap a layer of soluble starch film on the surface of the boric acid granules, the thickness of the starch film is 0.2mm, to obtain the coated base, and the particle diameter of the coated base is 2mm;

[0023] (2) Mix 40 parts by weight of isobutylidene diurea, 30 parts of bamboo charcoal powder, 5 parts of coated acid, 20 parts of starch and 20 parts of water, stir evenly, granulate into spherical shape, bake at 40-70 °C Dry to obtain the saline-alkali slow-release fertilizer, and the particle diameter of the saline-alkali slow-release fertilizer is 4mm.

[0024] Wherein, in the above-mentioned preparation method, the specific surface area of ​​the bamboo charcoal powder is 300-320m2 / Kg.

Embodiment 2

[0026] A slow-release fertilizer for saline-alkali land, the preparation method of which comprises the following steps:

[0027] (1) Wrap a layer of soluble starch film on the surface of the boric acid granules, the thickness of the starch film is 1mm, to obtain the coated alkali, the particle diameter of the coated alkali is 4mm;

[0028] (2) Mix 70 parts by weight of isobutylidene diurea, 50 parts of bamboo charcoal powder, 10 parts of coated acid, 30 parts of starch and 30 parts of water, stir evenly, and granulate into spherical shape, bake at 40-70°C dry to obtain the saline-alkali slow-release fertilizer, and the particle diameter of the saline-alkali slow-release fertilizer is 8mm.

[0029] Wherein, in the above-mentioned preparation method, the specific surface area of ​​the bamboo charcoal powder is 300-320m2 / Kg.

Embodiment 3

[0031] A slow-release fertilizer for saline-alkali land, the preparation method of which comprises the following steps:

[0032] (1) Wrap a layer of soluble starch film on the surface of the boric acid granules, the thickness of the starch film is 0.5mm, to obtain the coated alkali, the particle diameter of the coated alkali is 3mm;

[0033] (2) Mix 55 parts by weight of isobutylidene diurea, 40 parts of bamboo charcoal powder, 7 parts of coated acid, 25 parts of starch and 25 parts of water, stir evenly, and granulate into spherical shape, bake at 40-70 °C dry to obtain the saline-alkali slow-release fertilizer, and the particle diameter of the saline-alkali slow-release fertilizer is 5mm.

[0034] Wherein, in the above-mentioned preparation method, the specific surface area of ​​the bamboo charcoal powder is 300-320m2 / Kg.

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Abstract

The invention provides a preparation method of a slow-release fertilizer for saline-alkali soil. The preparation method comprises steps as follows: (1) surface layers of boric acid granules are coated with soluble starch films, and coated acid is obtained; (2) 40-70 parts by weight of isobutylidene-diurea, 30-50 parts by weight of bamboo charcoal powder, 5-10 parts by weight of coated acid, 20-30 parts by weight of starch and 20-30 parts by weight of water are mixed, stirred uniformly, granulated to be balls and dried, and the slow-release fertilizer for the saline-alkali soil is obtained. The slow-release fertilizer used for the saline-alkali soil and prepared with the preparation method can control the fertilizer release cycle of isobutylidene-diurea by controlling the coating thickness of coated acid, and the problems that alkaline soil inhibits hydrolysis of isobutylidene-diurea and fertilizer efficiency of isobutylidene-diurea is difficult to play are solved.

Description

technical field [0001] The invention belongs to the technical field of controlled-release fertilizers, in particular to a slow-release fertilizer for saline-alkali land and a preparation method thereof. Background technique [0002] Slow-release fertilizers are mainly slow-acting nitrogen fertilizers, also known as long-acting nitrogen fertilizers. Their solubility in water is very low, but after being applied to the soil, they will gradually decompose under the action of chemical reactions and microorganisms, and slowly release nitrogen to meet the needs of plants throughout the growth period. Nitrogen demand, reduce the cost of late topdressing, and reduce the loss caused by nitrogen leaching, volatilization and denitrification. Isobutylidene diurea is prepared from urea and isobutyraldehyde through 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 that of ure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/80C05G3/90C05G3/40C05G5/12C05G5/30
CPCC05C9/00C05G3/80C05G3/90C05G5/12C05D9/00C05D9/02C05F11/00Y02A40/22Y02P60/21
Inventor 宫晨琛金鸣慧周竞平芦令超程新
Owner UNIV OF JINAN
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