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Carrier type slow-release fertilizer and its preparing method

A slow-release fertilizer and carrier technology, applied in the field of fertilizer science, can solve problems such as rough production steps

Inactive Publication Date: 2004-01-28
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above is a very rough production step, in fact it may be more complicated, but the most critical issue is how to choose or synthesize this polymer system

Method used

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  • Carrier type slow-release fertilizer and its preparing method
  • Carrier type slow-release fertilizer and its preparing method
  • Carrier type slow-release fertilizer and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0026] [Example 3] Weigh 1.0g of natural pectin in a 250ml beaker, fully dissolve it in 50ml of boiling water, add 10g of urea, stir under an electric stirrer for 30min, then add 1ml of 25% glutaraldehyde solution, and react at 80°C for 30min , and then dried in an oven at 50°C to constant weight, ground the dried sample into powder with a mortar, weighed 0.0560g and pressed it into columnar particles with a punching machine.

[0027] [Example 4] Weigh 0.2g polyvinyl alcohol in a 250ml beaker, fully dissolve it in 50ml boiling water, add 10g urea, stir for 30min under an electric stirrer, then add 0.1ml12.5% ​​borax solution, fully Stir, then dry in an oven at 50°C to constant weight, grind the dried sample into powder with a mortar, weigh 0.0560g and press it into columnar particles with a punching machine

[0028] [Example 5] Weigh 2g of polyvinyl alcohol in a 250ml beaker, fully dissolve in 50ml of boiling water, add 10g of urea, stir for 30min under an electric stirrer, th...

Embodiment 9

[0032][Example 9] Weigh 1g of chitosan and 0.2g of citric acid in a 250ml beaker, fully dissolve in 50ml of boiling water, add 10g of urea, stir for 30min under an electric stirrer, and weigh 0.5g of pectin and dissolve it in 50ml In water, stir well, then add 1ml of 25% glutaraldehyde solution, stir fully at 80°C, then dry in an oven at 50°C until constant weight, grind the dried sample into powder with a mortar, weigh 0.0560g Press into columnar granules with a punching machine.

Embodiment 10

[0033] [Example 10] Weigh 0.5g chitosan and 0.1g citric acid in a 250ml beaker, fully dissolve in 50ml boiling water, add 10g urea, stir for 30min under an electric stirrer, and weigh 1g pectin and dissolve it in 50ml In water, stir well, then add 1ml of 25% glutaraldehyde solution, stir fully at 80°C, then dry in an oven at 50°C to constant weight, grind the dried sample into powder with a mortar, weigh 0.0560g and use Punching machine pressed into columnar particles

[0034] The application method of the carrier-type slow-release fertilizer provided by the present invention is the same as that of the common chemical fertilizer compounded with it. For example, the application method of the fertilizer compounded by the carrier substance and urea is the same as that of urea, and can be used as base fertilizer and top dressing .

[0035] The beneficial effect of the present invention is illustrated below by leaching test result:

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Abstract

The present invention discloses a carrier type slowly-released fertilizer and its preparation method. It not only has basic composition of general chemical fertilizer, but also contains carrier material, and its preparation method includes: firstly, dissolving carrier material with a certain quantity in water, then mixing general chemical fertilizer with it according to a certain proportion, uniformly stirring them to make them implement full reaction, adding cross-linking agent, making them implement further full reaction, removing water, finally pulverizing dried material and granulating.

Description

technical field [0001] The invention belongs to the technical field of fertilizer science related to plant nutrition, and relates to a slow-release fertilizer and a preparation method thereof, in particular to a carrier-type slow-release fertilizer and a preparation method thereof. Background technique [0002] In the past 40 years, the amount of chemical fertilizers used in the world has increased by 15 times, while the grain output has only increased by 3 to 4 times. The nearly 20 years from the 1980s to the present have seen the fastest increase in the amount of chemical fertilizers used in my country, but there has been no corresponding increase in grain production, which means that the utilization rate of fertilizers is getting lower and lower. At present, in the seasonal utilization rate of chemical fertilizers in my country, nitrogen is about 30-35%, phosphorus is about 10-25%, and potassium is 35-50%, which are far below the level of developed countries in the world....

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 杜昌文周健民
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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