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Nonmetallic mineral-based urea coated slow-release fertilizer particle and preparation method thereof

A non-metallic mineral, coated slow-release technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of low fertilizer nutrient utilization rate, surface water eutrophication, and nitrate nitrogen content exceeding the standard, and achieve good and sustainable development. The effect of biodegradability

Inactive Publication Date: 2016-02-03
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the utilization rate of fertilizer nutrients in my country is very low, and the loss rate of ordinary nitrogen fertilizers after being applied to the soil is as high as 70% through volatilization, leaching and denitrification
This not only causes waste of resources, increases agricultural costs, causes environmental pollution from fertilization, eutrophication of surface water, excessive nitrate nitrogen content in groundwater and vegetables, and nitrous oxide emissions, etc.

Method used

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  • Nonmetallic mineral-based urea coated slow-release fertilizer particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Weigh 5.048g of attapulgite, 1.001g of pond bottom sludge, 0.8g of organic fertilizer and add 30mL of deionized water to prepare a mixed solution A; then weigh 3.012g of urea and dissolve it in 30mL of deionized water to prepare a solution B . Set the temperature of the magnetic stirring device at 50°C, set the stirring speed to medium speed, slowly drop the solution B into the mixed solution A under stirring, and continue to stir for 3 hours after the dropwise addition. Then dry at 60° C., grind, granulate with water as a binder, and granulate after drying to obtain attapulgite soil-based urea granules.

[0018] Then weigh 5g of ethyl cellulose and dissolve it in 100mL of absolute ethanol, then add 2.5g of PEG60000 to obtain coating solution C; Spray on the surface of the attapulgite soil-based urea granules until the weight of the granules increases by about 15%, and dry at 60°C to obtain the attapulgite soil-based urea slow-release fertilizer granules BMU-...

Embodiment 2

[0022] Example 2 Weigh 6.021g of attapulgite, 1.010g of pond bottom sludge, 1.008g of organic fertilizer and add 30mL of deionized water to prepare mixed solution A; then weigh 2.014g of urea and dissolve it in 30mL of deionized water to prepare solution B . Set the temperature of the magnetic stirring device at 50°C, set the stirring speed to medium speed, slowly drop the solution B into the mixed solution A under stirring, and continue to stir for 3 hours after the dropwise addition. Then dry at 60° C., grind, granulate with water as a binder, and granulate after drying to obtain attapulgite soil-based urea granules. Weigh 5g of ethyl cellulose and dissolve it in 100mL of absolute ethanol, then add 2.5g of PEG60000 to obtain coating solution C; put 10g of attapulgite soil-based urea granules in a coating pan, and spray the coating solution evenly in a high-pressure spray gun Attapulgite soil-based urea slow-release fertilizer granules BMU-2 are obtained by drying the attapu...

Embodiment 3

[0024] Example 3 Weigh 4.035g of attapulgite, 1.008g of pond bottom sludge, and 1.208g of organic fertilizer and dissolve them in 30mL of deionized water to prepare a mixed solution A; then weigh 4.028g of urea and dissolve them in 30mL of deionized water to prepare a solution b. Set the temperature of the magnetic stirring device at 50°C, set the stirring speed to medium speed, slowly drop the solution B into the mixed solution A under stirring, and continue to stir for 3 hours after the dropwise addition. Then dry at 60° C., grind, granulate with water as a binder, and granulate after drying to obtain attapulgite soil-based urea granules. Weigh 5g of ethyl cellulose and dissolve it in 100mL of absolute ethanol, then add 2.5g of PEG60000 to obtain coating solution C; put 10g of attapulgite soil-based urea granules in a coating pan, and spray the coating solution evenly in a high-pressure spray gun Attapulgite soil-based urea slow-release fertilizer granule BMU-3 is obtained ...

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Abstract

The fertilizer nutrient utilization rate in our country is very low at present, after volatilization, leaching and denitrification of common nitrogenous fertilizers applied to soil, the loss late reaches 70%. The low utilization rate causes wasting of resources, increasing of agricultural cost, and pollution of environment due to fertilization. Porous structure and high absorption capacity of nonmetallic minerals are used, urea and nonmetallic minerals are compounded, aquaculture pond sediments and organic fertilizers are compounded to further increase slow-release effects, and ethyl cellulose is enveloped at an external layer for preparing a composite coated urea slow release fertilizer; in a simulated soil leaching test, a release rate at a first day is equal to or less than 15%, an accumulated release rate after 28th day is equal to or less than 75%, and the release rate meets the requirement of a national standard or an industrial standard of a sustained and controlled release fertilizer; the fertilizer has the advantages of safety, environmental protection and low cost, and has an important meaning for agricultural production and environmental protection.

Description

technical field [0001] The invention relates to a non-metallic mineral-based urea-coated slow-release fertilizer granule and a preparation method thereof. Background technique [0002] At present, the utilization rate of fertilizer nutrients in my country is very low, and the loss rate of common nitrogen fertilizers through volatilization, leaching and denitrification after being applied to the soil is as high as 70%. This not only causes a waste of resources, increases agricultural costs, causes environmental pollution from fertilization, eutrophication of surface water, excessive nitrate nitrogen content in groundwater and vegetables, and nitrous oxide emissions. Urea is currently the most used fertilizer among nitrogen fertilizers, so the development of urea-coated fertilizers with slow-release function is of great significance to agricultural production and the environment. [0003] Non-metallic minerals, such as attapulgite, diatomaceous earth, bentonite, kaolin, etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 潘国祥郑卫红倪生良陈海锋徐敏虹陈伽唐培松曹枫
Owner HUZHOU TEACHERS COLLEGE