A kind of slow-release fertilizer and preparation method thereof

A technology of slow-release fertilizers and coating materials, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve problems such as pollution, not easy to degrade, and soil degradation, and achieve high economic benefits and uniform and stable release

Active Publication Date: 2017-10-27
北京水木沃土生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to different coating materials, coated slow-release fertilizers can be divided into organic coated slow-release fertilizers and inorganic coated slow-release fertilizers. Among them, inorganic coated materials such as sulfur-coated urea, because sulfur is easily broken, the fertilizer dissolves and releases Faster, the fertilizer decomposes and loses quickly, and the slow-release effect is not ideal
The organic coating material is not easy to degrade in the soil, and it is easy to remain in the agricultural soil to cause soil degradation and serious pollution.
[0006] Disclosed in CN101229985A is a kind of chitosan-coated controlled-release fertilizer and its preparation method. The fertilizer is formed by the common chemical fertilizer as the core and the chitosan coating layer. However, the slow-release rate of the slow-release fertilizer is not constant

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Dissolve cyclodextrin, chitosan and chitosan oligosaccharide with 5% acetic acid to make chitosan acetic acid solution, stir at 1500rpm for 15 minutes, add the acid solution to the mixed solution of 5%HAc / montmorillonite In, continue to stir for 3 hours, prepare the solution of coating material;

[0053] (2) Put the fertilizer granules to be coated into a coating machine, spray the solution of the coating material under the rotation of the coating machine, mix evenly, heat up, and dry to obtain dry granules;

[0054] (3) Then add the dried granules to an aqueous solution of 0.1% borax crosslinking agent, soak for 30 minutes, filter, and dry the resulting solid to obtain slow-release fertilizer granules.

[0055] Wherein in the drying step, drying to a water content less than or equal to 4.0%.

[0056] The fertilizer used in Example 1 is urea. After the coating is completed, the film material is 7.5% of the weight of the fertilizer, and the N content of the fertilizer i...

Embodiment 2

[0058] Dissolve cyclodextrin, chitosan and oligochitosan with 5% phosphoric acid to make a phosphoric acid solution, stir at 1500rpm for 20 minutes, add the acid solution to the mixed solution of 5% phosphoric acid / montmorillonite, continue Stirring for 3 hours to prepare a solution of the coating material;

[0059] Put the fertilizer granules to be coated into the coating machine, spray the coating material solution under the rotation of the coating machine, mix evenly, heat up, and dry to obtain dry granules;

[0060] Then the dry granules are added into an aqueous solution of borax crosslinking agent with a mass concentration of 10%, soaked for 10 minutes, filtered, and the obtained solid is dried to obtain slow-release fertilizer granules.

[0061] Wherein in the drying step, drying to a water content less than or equal to 4.0%.

[0062] The fertilizer used in Example 1 is urea. After the coating is completed, the film material is 8.2% of the weight of the fertilizer, and...

experiment example

[0070] Measure the dissolution test of the above samples at 25°C according to the national standard (GB / T 23348-200) of "Slow Release Fertilizer" formulated by my country in 2009: Weigh 10g of fertilizer and put it into a double-layer pouch made of 100-mesh nylon gauze , seal, put the pouch into a plastic bottle containing 250ml of distilled water, cover and seal it, incubate at a constant temperature of 25°C, take samples at regular intervals, transfer the water sample to another small bottle for each sampling, shake well and measure the sample. Add 250ml of distilled water again in the vial that nylon cloth is housed again, put into constant temperature Puyang county after affixing a seal, continue to cultivate, every kind of fertilizer carries out 3 parallel tests. According to the test results, calculate and measure the initial dissolution rate of the fertilizer dissolved in the fertilizer core within 24 hours, and the cumulative dissolution rate at 28, 60 and 90 days.

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Abstract

The invention discloses a coating material for controlled release fertilizer, controlled release fertilizer comprising a core layer and an enveloping layer covering the core layer, and a preparation method of the controlled release fertilizer. The coating material comprises 30 to 50 parts of montmorillonite, 40 to 60 parts of mixture of chitosan and chitosan oligosaccharide, wherein the chitosan oligosaccharide consists of oligosaccharide with weight-average molecular weight of 4000 to 6000 and chitosan with weight-average molecular weight of 50000 to 10000, the weight ratio of the chitosan to oligosaccharide is (80% to 95%) to (20% to 5%); 1 to 8 parts of cyclodextrin and 1 to 5 parts of optional cross-linking agent. The controlled release fertilizer is low, uniform and constant in fertilizer releasing speed; all indexes conform to the national standard GB / T 23348-200. Compared with commercially-available non-controlled release fertilizer, under the situation of identical yield of crops, by adopting the controlled release fertilizer of embodiments 1 to 5, the application amount of fertilizer can be reduced by 30 to 40 percent.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a coating material for fertilizers, a slow-release fertilizer comprising the coating material as a coating layer, and a preparation method thereof. Background technique [0002] According to statistics from the Food and Agriculture Organization of the United Nations (FAO), 55% of the increase in food production in developing countries comes from the role of chemical fertilizers. Due to volatilization, loss, penetration and other factors, the seasonal utilization rate of my country's chemical fertilizers is about 30-35% for nitrogen fertilizer, 10-25% for phosphorus fertilizer, and 35-50% for potash fertilizer, which are far below the level of developed countries. Low fertilizer use efficiency not only causes huge economic losses, but also causes serious environmental pollution, such as making the nitrate content of groundwater seriously exceed the standard; Nitrogen moves down with wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 吴朱冠宇
Owner 北京水木沃土生物科技有限公司
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