Double-control composite slow-release fertilizer and method for preparing same

A slow-release fertilizer and compound technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of unsatisfactory slow-release effect of cemented slow-release fertilizers, reduce secondary environmental pollution, improve fertilizer utilization, The effect of simplifying agricultural operations

Active Publication Date: 2007-10-03
SOIL & FERTILIZER INST CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slow-release effect of cemented slow-release fertilizers is often not ideal

Method used

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  • Double-control composite slow-release fertilizer and method for preparing same
  • Double-control composite slow-release fertilizer and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 27kg of urea, 18kg of monoammonium phosphate, 15kg of potassium sulfate, 30kg of weathered coal humic acid, 10kg of phosphate rock powder, and pass through a 60-70 mesh sieve after crushing. 60kg of nitrogen, phosphorus and potassium fertilizer raw materials and 30kg of weathered coal humic acid Mix thoroughly, and add about 10±2kg water to make the raw material mixture have a certain humidity; the raw material mixture is granulated in the granulating disc machine; the granulated material is sent to the rotary drying cylinder for drying; After sieving the powder and the large particles larger than 5mm, they are all used as return materials and recycled; the particles larger than 2mm and smaller than 5mm are added to the disc granulator and 10kg phosphate rock powder is added to roll coating, drying or Air-dry is the finished product.

Embodiment 2

[0028] Take 20kg of urea, 26kg of monoammonium phosphate, 21kg of potassium sulfate, 23kg of weathered coal humic acid, 10kg of calcium-magnesium phosphate fertilizer, crushed and passed through a 60-70 mesh sieve, 67kg of nitrogen, phosphorus, potassium fertilizer raw materials and 13kg of weathered coal humic acid Mix thoroughly, and add about 10±2kg water to make the raw material mixture have a certain humidity; the raw material mixture is granulated in the granulating disc machine; the granulated material is sent to the rotary drying cylinder for drying; After sieving the powders and large particles larger than 5mm, they are all used as return materials for recycling; add 10kg calcium magnesium phosphate fertilizer to the disc granulator for particles larger than 2mm and smaller than 5mm, then roll coating, drying or Air-dry is the finished product.

Embodiment 3

[0030] Take 27kg of urea, 18kg of calcium phosphate, 15kg of potassium sulfate, 30kg of weathered coal humic acid, 10kg of calcium-magnesium phosphate fertilizer, and pass through a 60-70 mesh sieve after crushing. 60kg of nitrogen, phosphorus and potassium fertilizer raw materials and 30kg of weathered coal humic acid are fully Mix and add about 10±2kg water to make the raw material mixture have a certain humidity; the raw material mixture is granulated in the granulating disc machine; the granulated material is sent to the rotary drying cylinder for drying; the powder less than 2mm After sieving the large particles and the large particles larger than 5mm, they are all used as return materials and recycled; the particles larger than 2mm and smaller than 5mm are added to the disc granulator with 10kg calcium magnesium phosphate fertilizer, and then rolled, dried or air-dried , Which is the finished product.

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Abstract

The present invention discloses a composite type of slow-release fertilizer with double control and its method for making. The said composite type of slow-release fertilizer with double control which comprises fertilizing materials of nitrogen, phosphor and kalium, cementing and bonding materials of agenthumic acid in weathered coal and clad materials is obtained by passing a screen of 60-70 meshes, mixing, pelleting, drying, bolting and cladding the said meterials. The invention adopts a measure of slow-release fertilizer wrapping slow-release fertilizer, enhances the slow-release effect and the availability ratio (10-15 %) of the fertilizer, releases slowly according to the nutrient need for the crops, simplifies the cropping agro-operation and derates the secondary environmental pollution, so it is an organic and inorganic composite type of slow-release fertilizer with multicomponent and multiple function; it is characterized in that it is of easy making technology and operation, low productive investment and cost, broad sources for stocks, high mechanical strength(>=12 N) of particles of fertilizer, no slaking, convenient transport and use, so its application prospect is broad in the production.

Description

Technical field [0001] The invention relates to a fertilizer and a preparation method thereof, in particular to a coated and cemented dual-control organic compound slow-release fertilizer and a preparation method thereof. Background technique [0002] At present, there are two main types of coating materials used in coated slow-release fertilizers developed at home and abroad. One is organic high molecular polymers (such as resin polyolefins), and the other is poorly water-soluble or slightly soluble inorganic materials ( Such as sulfur, phosphate rock powder, calcium magnesium phosphate fertilizer, etc.). The production of polymer-coated slow-release fertilizers requires special coating towers and solvents. The coating materials are expensive and the production process costs are relatively high. The coating materials decompose slowly in the soil and easily remain. However, the controlled release performance of polymer materials is better. High-molecular-weight polymer coated slo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G1/00
Inventor 赵秉强李燕婷李秀英李小平王丽霞
Owner SOIL & FERTILIZER INST CHINESE ACAD OF AGRI SCI
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