Slow release urea containing gamma-polyglutamic acid and urease inhibitor and preparation method thereof

Abstract

The invention discloses slow release urea containing gamma-polyglutamic acid and a urease inhibitor. The slow release urea is obtained by spraying a coated slow release solution onto the outer surface of urea particles and drying, wherein the coated slow release solution contains gamma-polyglutamic acid and a urease inhibitor. The invention further discloses a preparation method of the slow release urea. The gamma-polyglutamic acid and the urease inhibitor in the slow release urea have synergic actions, and the gamma-polyglutamic acid can form a layer of protective film on the surfaces of a fertilizer and the urease inhibitor, so that the utilization ratio of the fertilizer is increased, and environmental pollution is lowered.

Description

technical field

[0001] The invention relates to a slow-release fertilizer, in particular to a slow-release urea containing gamma-polyglutamic acid and a urease inhibitor and a preparation method thereof. Background technique

[0002] In modern agricultural production, chemical fertilizers play an increasingly important role. In 2011, the annual consumption of chemical fertilizers in my country was 54.6 million tons (converted to pure nitrogen, phosphorus and potassium), among which the consumption of nitrogen fertilizer was the largest, about 28 million tons (converted to pure). 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 tons of urea. What is more serious is that chemical fertilizers have and will continue to It has brought many adverse consequences to our living environment, such as soil compaction, wa...

Examples

Embodiment 1

[0037] Example 1: Slow-release urea suitable for rice.

[0038] 1. The coated sustained-release solution is composed of the following substances in mass percentage:

[0039] 2.5% γ-polyglutamic acid, 3.0% hydroquinone, 0.1% citric acid, 0.2% polyvinyl alcohol, 0.2% gum arabic, 0.2% sodium dodecylbenzenesulfonate, the rest is water, pH 6.5.

[0040] 2. Preparation of coated sustained-release solution: Add the prescribed amount of water into the reactor, start stirring, heat until the water temperature reaches 60°C, add the prescribed amount of hydroquinone, stir for 8 minutes, then add the prescribed amount of citric acid and polyethylene Alcohol, gum arabic, 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 6.5, cooled and then transferred to a storage tank for later use.

[0041] 3. Preparation of slow-release urea: Under the air pressure of 0.60MPa, the ...

Embodiment 2

[0042] Example 2: Slow-release urea suitable for tomato.

[0043]1. The coated sustained-release solution is composed of the following substances in mass percentage:

[0044] γ-polyglutamic acid 3%, hydroquinone 3.0%, citric acid 1%, gum arabic 0.5%, sodium dodecylbenzenesulfonate 0.4%, the rest is water, pH 6.8.

[0045] 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 hydroquinone, stir for 10 minutes, then add the prescribed amount of citric acid and gum arabic 1. Sodium dodecylbenzene sulfonate, stirred for 10 minutes, and finally added γ-polyglutamic acid in the formula and stirred until completely dissolved, adjusted to pH 6.8, cooled and then transferred to a storage tank for later use.

[0046] 3. Preparation of slow-release urea: Under the air pressure of 0.55MPa, the coated slow-release liquid is sucked into the injecto...

Embodiment 3

[0047] Example 3: Sustained release urea for citrus.

[0048] 1. The coated sustained-release solution is composed of the following substances in mass percentage:

[0049] 3.5% γ-polyglutamic acid, 2.5% hydroquinone, 0.5% citric acid, 0.2% tartaric acid, 0.5% gum arabic, 0.7% sodium dodecylbenzenesulfonate, the rest is water, pH 6.8.

[0050] 2. Preparation of coated sustained-release solution: Add the prescribed amount of water into the reactor, start stirring, heat until the water temperature reaches 50°C, add the prescribed amount of hydroquinone, stir for 10 minutes, then add the prescribed amount of citric acid, tartaric acid, Gum arabic and sodium dodecylbenzenesulfonate, stirred for 10 minutes, and finally added the formula amount of γ-polyglutamic acid and stirred until completely dissolved, adjusted to pH 6.5, cooled and then transferred to a storage tank for later use.

[0051] 3. Preparation of slow-release urea: Under the air pressure of 0.50MPa, the coated slow-r...

technical field

[0001] The invention relates to a slow-release fertilizer, in particular to a slow-release urea containing gamma-polyglutamic acid and a urease inhibitor and a preparation method thereof. Background technique

[0002] In modern agricultural production, chemical fertilizers play an increasingly important role. In 2011, the annual consumption of chemical fertilizers in my country was 54.6 million tons (converted to pure nitrogen, phosphorus and potassium), among which the consumption of nitrogen fertilizer was the largest, about 28 million tons (converted to pure). 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 tons of urea. What is more serious is that chemical fertilizers have and will continue to It has brought many adverse consequences to our living environment, such as soil compaction, wa...

Examples

Embodiment 1

[0037] Example 1: Slow-release urea suitable for rice.

[0038] 1. The coated sustained-release solution is composed of the following substances in mass percentage:

[0039] 2.5% γ-polyglutamic acid, 3.0% hydroquinone, 0.1% citric acid, 0.2% polyvinyl alcohol, 0.2% gum arabic, 0.2% sodium dodecylbenzenesulfonate, the rest is water, pH 6.5.

[0040] 2. Preparation of coated sustained-release solution: Add the prescribed amount of water into the reactor, start stirring, heat until the water temperature reaches 60°C, add the prescribed amount of hydroquinone, stir for 8 minutes, then add the prescribed amount of citric acid and polyethylene Alcohol, gum arabic, 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 6.5, cooled and then transferred to a storage tank for later use.

[0041] 3. Preparation of slow-release urea: Under the air pressure of 0.60MPa, the ...

Embodiment 2

[0042] Example 2: Slow-release urea suitable for tomato.

[0043]1. The coated sustained-release solution is composed of the following substances in mass percentage:

[0044] γ-polyglutamic acid 3%, hydroquinone 3.0%, citric acid 1%, gum arabic 0.5%, sodium dodecylbenzenesulfonate 0.4%, the rest is water, pH 6.8.

[0045] 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 hydroquinone, stir for 10 minutes, then add the prescribed amount of citric acid and gum arabic 1. Sodium dodecylbenzene sulfonate, stirred for 10 minutes, and finally added γ-polyglutamic acid in the formula and stirred until completely dissolved, adjusted to pH 6.8, cooled and then transferred to a storage tank for later use.

[0046] 3. Preparation of slow-release urea: Under the air pressure of 0.55MPa, the coated slow-release liquid is sucked into the injecto...

Embodiment 3

[0047] Example 3: Sustained release urea for citrus.

[0048] 1. The coated sustained-release solution is composed of the following substances in mass percentage:

[0049] 3.5% γ-polyglutamic acid, 2.5% hydroquinone, 0.5% citric acid, 0.2% tartaric acid, 0.5% gum arabic, 0.7% sodium dodecylbenzenesulfonate, the rest is water, pH 6.8.

[0050] 2. Preparation of coated sustained-release solution: Add the prescribed amount of water into the reactor, start stirring, heat until the water temperature reaches 50°C, add the prescribed amount of hydroquinone, stir for 10 minutes, then add the prescribed amount of citric acid, tartaric acid, Gum arabic and sodium dodecylbenzenesulfonate, stirred for 10 minutes, and finally added the formula amount of γ-polyglutamic acid and stirred until completely dissolved, adjusted to pH 6.5, cooled and then transferred to a storage tank for later use.

[0051] 3. Preparation of slow-release urea: Under the air pressure of 0.50MPa, the coated slow-r...

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