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Efficient slow-release urea and preparation method thereof

A slow-release urea and high-efficiency technology, which is applied in the fields of agricultural gas emission reduction, fertilizer mixture, fertilization equipment, etc., can solve the problems of easy leaching loss, separation, and influence on nitrification inhibition effect, and achieve great market demand potential and good prospects , Reduce the effect of leaching and runoff loss

Active Publication Date: 2012-07-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Nitrification inhibitors are now added to many fertilizers, but nitrification inhibitors are highly mobile in the soil profile and are easily separated from ammonium ions, thus affecting their nitrification inhibitory effect, and heavy rainfall occurs in soils with high sand content and poor water retention capacity. Leaching loss is prone to occur, so the development of an efficient and environmentally friendly slow-release fertilizer has far-reaching significance today when the country vigorously advocates energy conservation and emission reduction

Method used

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  • Efficient slow-release urea and preparation method thereof
  • Efficient slow-release urea and preparation method thereof
  • Efficient slow-release urea and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: High-efficiency slow-release urea suitable for vegetables.

[0032] 1. The coated sustained-release solution is composed of the following substances in mass percentage:

[0033] 3.0% of γ-polyglutamic acid, 3.0% of dicyandiamide, 0.5% of polyvinyl alcohol, 3.0% of carboxymethyl cellulose, 0.3% of sodium dodecylbenzenesulfonate, the rest is water, pH 6.0.

[0034] 2. Preparation of coated sustained-release solution: Add the prescribed amount of water into the reactor, start stirring, heat until the water temperature reaches 55°C, add the prescribed amount of dicyandiamide, stir for 10 minutes, then add the prescribed amount of polyvinyl alcohol, Carboxymethyl cellulose and sodium dodecylbenzene sulfonate, stirred for 10 minutes, and finally added the formula amount of γ-polyglutamic acid and stirred until completely dissolved, adjusted to pH 6.0, cooled and then transferred to a storage tank for later use.

[0035] 3. Preparation of high-efficiency slow-relea...

Embodiment 2

[0036] Embodiment 2: Efficient slow-release urea suitable for peach trees.

[0037] 1. The coated slow-release solution is composed of the following substances in weight percentage:

[0038] 5% of γ-polyglutamic acid powder, 1% of thiourea, 0.5% of polyvinyl alcohol, 0.05% of sodium dodecylbenzenesulfonate, and the rest is water, pH 6.1.

[0039] 2. Preparation of coated sustained-release solution: Add the prescribed amount of water into the reactor, start stirring, heat until the water temperature reaches 65°C, add the prescribed amount of thiourea, stir for 10 minutes, then add the prescribed amount of polyvinyl alcohol, ten Sodium dialkylbenzene sulfonate, stirred for 5 minutes, and finally added γ-polyglutamic acid in the prescribed amount and stirred until completely dissolved, adjusted to pH 6.1, cooled and then transferred to a storage tank for later use.

[0040] 3. Preparation of high-efficiency urea: Under 0.7MPa air pressure, the coated slow-release liquid is sucke...

Embodiment 3

[0041] Example 3: High-efficiency slow-release urea suitable for wheat.

[0042] By γ-polyglutamic acid 1.5% (weight percentage, the same below), dicyandiamide 2.0%, polyvinyl alcohol 0.5%, gum arabic 2.5%, polyoxyethylene alkyl ether 1.0%, the rest is water, pH The coated slow-release liquid composed of 6.5 is coated with a fluidized bed to make high-efficiency slow-release urea suitable for wheat, wherein the sprayed weight of the coated slow-release liquid accounts for 0.6% of the urea weight.

[0043] In order to study the impact of this product on the yield and fertilizer utilization efficiency of potted wheat, we also processed the following two kinds of fertilizers as a contrast, (1) made of γ-polyglutamic acid 1.5%, polyvinyl alcohol 0.5%, and gum arabic 2.5% , polyoxyethylene alkyl ether 1.0%, the rest is water, and the coated slow-release liquid composed of pH 6.5 is made into gamma-polyglutamic acid coated urea through fluidized bed coating; (2) made of dicyandiamid...

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Abstract

The invention discloses an efficient slow-release urea. The efficient slow-release urea is prepared by coating urea by utilizing a coating slow-release solution and drying and solidifying the coated urea, wherein the coating slow-release solution consists of the following components in percentage by mass: 1 to 5 percent of gamma-polyglutamic acid, 1 to 5 percent of nitration inhibitor, 0.5 to 5 percent of adhesive, 0.05 to 2 percent of surfactant and the balance of water; and the pH of the efficient slow-release urea is 5.5 to 6.5. The invention also discloses the preparation method of the efficient slow-release urea. The gamma-polyglutamic acid in the efficient slow-release urea has the effects of coating and chelating the urea and the nitration inhibitor, so that separation of the nitration inhibitor and a nitrogen fertilizer is reduced, leaching and runoff losses of nitrate nitrogen are reduced, one-time fertilization can be realized, top dressing is not required, the utilization rate of the fertilizer can be improved by over 15 percent, and the yield of the crops is increased by 10 to 30 percent.

Description

technical field [0001] The invention relates to a slow-release fertilizer, in particular to a slow-release urea coated with gamma-polyglutamic acid and a nitrification inhibitor and a preparation method thereof. Background technique [0002] At the Fourth Session of the Eleventh National People's Congress in 2011, Wei Chao'an, Vice Minister of Agriculture, stated at the meeting that the annual consumption of chemical fertilizers in my country was 54.6 million tons (converted to pure nitrogen, phosphorus, and potassium), which would contribute to agricultural development and increase farmers' income, especially grain production. made an important contribution. Among them, nitrogen fertilizer consumption is the largest, about 28 million tons (pure conversion). However, the average loss of nitrogen fertilizer is as high as 45% through volatilization, leaching and runoff, resulting in an annual loss of more than 12 million tons of nitrogen, equivalent to more than 27 million ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/90
CPCY02P60/21
Inventor 徐虹许宗奇周哲冯小海李莎张扬欧阳平凯
Owner NANJING UNIV OF TECH
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