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Method for releasing actual effect of fertilizer, actual effect releasing type controlled release fertilizer and preparation method

A technology of chemical fertilizer and effective effect, which is applied in the field of controlled release chemical fertilizer, effective release of chemical fertilizer, effective release controlled release chemical fertilizer and its preparation, which can solve the problems of regular release, far different fertilizer supply speed curves, and inability to achieve effective release, etc. Achieve the effect of little pollution and no pollution to the environment

Inactive Publication Date: 2010-05-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, the crop fertilizer demand curve usually contains one or more fertilizer demand peaks, especially in the middle and late stages of crops, there are usually fertilizer demand peaks. Although the prior art coated fertilizer uses the coating to release the fertilizer slowly, it can be released within a certain period of time. However, the law of the fertilizer supply speed curve is far from the law of the crop fertilizer demand curve (for example, the shape of the crop fertilizer demand law curve with one, two and three fertilizer demand peaks is shown in the attached figure 2 , "T" in the figure is the crop growth period)
Therefore, the prior art coated chemical fertilizers cannot be released according to or roughly according to the law of crop fertilizer demand, that is, the effective release cannot be realized. This is the defect and problem of the prior art coated chemical fertilizers.

Method used

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  • Method for releasing actual effect of fertilizer, actual effect releasing type controlled release fertilizer and preparation method
  • Method for releasing actual effect of fertilizer, actual effect releasing type controlled release fertilizer and preparation method
  • Method for releasing actual effect of fertilizer, actual effect releasing type controlled release fertilizer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Add 1 kg of spherical industrial urea with a particle size of 2.0 to 4.0mm into the drum coating equipment with a temperature control of 65°C, and rotate the drum (rotating speed 70r / min) to make the spherical urea flow in the drum. Spray the nitrocellulose solution (the solvent is a mixed solvent of ethanol, acetone and amyl acetate) on the surface of spherical urea until the quality of the nitrocellulose film formed by spraying on the surface of 1 kg of spherical urea reaches 0.02 kg. Then, add 0.5kg particle diameter to the drum coating equipment and be the spherical industrial urea of ​​2.0~4.0mm, continue spraying nitrocellulose solution (solvent is the mixed solvent of ethanol, acetone and amyl acetate three), until in The quality of the cellulose nitrate film layer newly sprayed on the surface of 1.5 kg spherical urea reaches 0.045 kg, and the solvent in the film layer is fully dried to remove it. Thereafter, the temperature of the spherical urea in the drum was ...

Embodiment 2

[0057] Add 1 kg of spherical industrial urea with a particle size of 2.0 to 4.0 mm into the drum coating equipment I with a temperature control of 95° C., and rotate the drum (rotating speed 70 r / min) to make the spherical urea flow in the drum. Slowly spray the polystyrene toluene solution containing the plasticizer dioctyl phthalate (the mass ratio of polystyrene: dioctyl phthalate is 9:1) on the surface of spherical urea until it reaches 1kg The quality of the plasticized polystyrene film layer formed by spraying the spherical urea surface reaches 0.03kg. Then, continue to spray the polylactic acid chloroform solution containing cornstarch (the mass ratio of polylactic acid: cornstarch is 9: 1), spray until the quality of the polylactic acid film layer containing cornstarch formed on the surface of 1kg spherical urea reaches 0.12kg. The resulting coated urea is component A.

[0058] Add 1.5 kg of spherical industrial urea with a particle size of 2.0 to 4.0 mm into the drum...

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Abstract

The invention discloses a method for releasing the actual effect of a fertilizer, an actual effect releasing type controlled release fertilizer and a preparation method. In the method for releasing the actual effect of the fertilizer, burst release type coated fertilizers having different burst release periods are mixed or the burst release type coated fertilizers and slow release and / or non-coated fertilizers are mixed into multiple mixed fertilizers so as to realize the release of actual effect. The actual effect releasing type controlled release fertilizer is the multiple fixed fertilizer comprising two or more burst release type coated fertilizers having different burst release periods or the multiple fixed fertilizer containing the burst release type coated fertilizers, wherein the burst release type coated fertilizer is preferably a coated fertilizer which is coated by environment-degraded polar polymer film layers or the coated fertilizer which is coated by complex film layers containing the environment-degraded polar polymer film layers. The fertilizer feeding speed curve of the actual effect releasing type controlled release fertilizer can be basically similar to the fertilizer demand curve of crops, thereby basically realizing the release on demand.

Description

1. Technical field [0001] The invention relates to controlled-release chemical fertilizers, in particular to a method for effective release of chemical fertilizers, effective-release controlled-release chemical fertilizers and a preparation method thereof, belonging to the field of chemical fertilizer industry. 2. Background technology [0002] At present, most of the chemical fertilizers used in the agricultural field are instant and easily decomposed fertilizers, and the effective utilization rate is only 30%-40%. The waste of chemical fertilizers is very alarming. Coating chemical fertilizers with coating materials to make coated fertilizers, and using coatings to release chemical fertilizers slowly is the most important and effective method to improve the utilization rate of chemical fertilizers. Coated fertilizers are currently the research of agricultural fertilizers in various countries in the world. development focus. [0003] There are two types of coated fertilize...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 应宗荣
Owner NANJING UNIV OF SCI & TECH