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Ammonium-sulfate-coated urea nitrogen fertilizer, ammonium-sulfate-coated urea sustained-controlled release fertilizer and their preparation and application

A technology of coating urea and ammonium sulfate, which is applied in the direction of urea compound fertilizer, application, nitrogen fertilizer, etc., can solve the problems of poor controllability of fertilizer release rate, limit the application of food crops, and poor control of film thickness, so as to improve the utilization rate of nitrogen fertilizer , lower concentration, lower ammonia volatilization loss

Inactive Publication Date: 2018-09-21
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of material still has the problems of poor control of film thickness, poor controllability of fertilizer release rate, and easy formation of secondary pollution.
In recent years, the coating technology of coated fertilizer has become increasingly mature, but the high price of coated fertilizer limits its application in food crop production

Method used

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  • Ammonium-sulfate-coated urea nitrogen fertilizer, ammonium-sulfate-coated urea sustained-controlled release fertilizer and their preparation and application
  • Ammonium-sulfate-coated urea nitrogen fertilizer, ammonium-sulfate-coated urea sustained-controlled release fertilizer and their preparation and application
  • Ammonium-sulfate-coated urea nitrogen fertilizer, ammonium-sulfate-coated urea sustained-controlled release fertilizer and their preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) 25 parts of ammonium sulfate are mixed with water to obtain a saturated solution of ammonium sulfate;

[0050] (2) Place 75 parts of urea granules in a stirring dryer at 60°C, and in a stirring state at 60 rpm, spray the saturated ammonium sulfate solution prepared in step (1) in the stirring dryer to make the aqueous solution of ammonium sulfate uniform Coated on the surface of urea granules (with a particle size of 3-4mm), the spraying speed of the ammonium sulfate aqueous solution should be such that the surface of the urea is wet but does not produce water accumulation; Sieve to obtain the ammonium sulfate-coated urea nitrogen fertilizer with urea as the inner core and the ammonium sulfate layer coated outside the inner core (the structure schematic diagram is shown in figure 1 ).

[0051] The ammonium sulfate coated urea nitrogen fertilizer that the present embodiment makes is suitable for sticky heavy soil; Its concrete application method is:

[0052] Winter...

Embodiment 2

[0057] (1) 20 parts of ammonium sulfate are mixed with water to obtain a saturated solution of ammonium sulfate;

[0058] (2) 80 parts of urea granules are placed in a stirring dryer at 50° C., and in a stirring state at 60 rpm, the saturated ammonium sulfate solution prepared in step (1) in the stirring dryer is sprayed to make the aqueous solution of ammonium sulfate uniform Coated on the surface of urea granules (with a particle size of 3-4mm), the spraying speed of the ammonium sulfate aqueous solution should be such that the surface of the urea is wet but does not produce water accumulation; Sieve to obtain ammonium sulfate-coated urea nitrogen fertilizer with urea as the inner core and an ammonium sulfate layer outside the inner core.

[0059] The ammonium sulfate-coated urea nitrogen fertilizer prepared in this example is suitable as a base fertilizer and suitable for loam soil; suitable crops include winter wheat, summer corn, vegetables, fruit trees, vegetables and ot...

Embodiment 3

[0064] (1) 15 parts of ammonium sulfate are mixed with water to obtain a saturated solution of ammonium sulfate;

[0065] (2) 85 parts of urea granules are placed in a stirring dryer at 70° C., and in a stirring state at 60 rpm, the saturated ammonium sulfate solution prepared in step (1) in the stirring dryer is sprayed to make the aqueous solution of ammonium sulfate uniform Coated on the surface of urea granules (with a particle size of 3-4mm), the spraying speed of the ammonium sulfate aqueous solution should be such that the surface of the urea is wet but does not produce water accumulation; Sieve to obtain ammonium sulfate-coated urea nitrogen fertilizer with urea as the inner core and an ammonium sulfate layer outside the inner core.

[0066] The ammonium sulfate-coated urea nitrogen fertilizer prepared in this example is suitable as a base fertilizer, and is suitable for sandy loam soil. In sandy loam soil, it is better to apply 10-15 cm into the soil. Suitable crops ...

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Abstract

The invention belongs to the technical field of fertilizer and particularly relates to ammonium-sulfate-coated urea nitrogen fertilizer, ammonium-sulfate-coated urea sustained-controlled release fertilizer and their preparation and application. The ammonium-sulfate-coated urea nitrogen fertilizer uses urea as a core that is coated with an ammonium sulfate layer, an ammonium sulfate / paraffin mixture layer or an ammonium sulfate / sulfur mixture layer, wherein when the core is coated with the ammonium sulfate layer, the mass ratio of urea to ammonium sulfate is (75-85):(15-25); when the core is coated with the ammonium sulfate / paraffin mixture layer, the mass ratio of urea, ammonium sulfate and paraffin is (75-85):(15-25):10; when the core is coated with the ammonium sulfate / sulfur mixture layer, the mass ratio of urea, ammonium sulfate and sulfur is (75-85):(15-25):10. The ammonium-sulfate-coated urea nitrogen fertilizer helps effectively reduce the concentration of ammonium ions in soil,significantly inhibit ammonia volatilization and gain increased utilization rate, and is suitable for acting as a base fertilizer for dry farmed crops, as well as a topdressing.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to an ammonium sulfate-coated urea nitrogen fertilizer, an ammonium sulfate-coated urea slow-release fertilizer and its preparation and application. Background technique [0002] In dry land, urea is hydrolyzed into ammonium ions, and ammonium ions are converted into nitrate nitrogen under the action of nitrifying bacteria. The hydrolysis of urea is controlled by urease activity, and the conversion of ammonium ions to nitrate nitrogen is controlled by nitrifying bacteria. The latter of which is the speed limiting factor. When urea is hydrolyzed, the ammonium ions accumulated in the soil interstitial water form a very high concentration, and ammonia is easily formed and lost by volatilization. It is estimated that ammonia volatilization can account for about 20% of nitrogen loss in drylands, and even as high as more than 60% in some areas. Therefore, avoiding exces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G1/00A01C21/00C05G3/90
CPCA01C21/005C05C3/00C05G3/90C05G5/30C05C9/00Y02P60/21
Inventor 徐晓峰刘晨洲郭大勇周文利常会庆石兆勇寇太记
Owner HENAN UNIV OF SCI & TECH
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