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Slow-controlled release fertilizer and preparation method thereof

A technology of controlled-release fertilizers and fertilizers, applied in the direction of fertilizer mixtures, phosphate fertilizers, fertilization devices, etc., can solve the problems of not having water absorption, water retention performance, and inapplicability, so as to reduce the damage of soil and water quality, improve utilization rate, and reduce leaching lost effect

Inactive Publication Date: 2019-12-20
MEILIGUOTU BEIJING ECOLOGICAL ENVIRONMENT ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it does not have water absorption and water retention properties, and is not suitable for areas with drought, water shortage or large daily evaporation

Method used

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  • Slow-controlled release fertilizer and preparation method thereof
  • Slow-controlled release fertilizer and preparation method thereof
  • Slow-controlled release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0078] In a third aspect, the present invention provides a method for preparing the slow-release fertilizer described in the first aspect or / and the second aspect, comprising:

[0079] Step 1. Fertilizer core preparation: use the above-mentioned bentonite and potassium fertilizer to first coat the nitrogen fertilizer to obtain the first coated particles; then use the above-mentioned bentonite and phosphate fertilizer to perform the second coating process on the above-mentioned first core particles to obtain the above-mentioned fertilizer kernel.

[0080] The above-mentioned first coating treatment includes: adding the above-mentioned nitrogen fertilizer in the disc granulator, spraying atomized water to wet the surface of the above-mentioned nitrogen fertilizer; adding the powder mixed with the above-mentioned bentonite and potassium fertilizer; then repeating the above-mentioned "spraying Add atomized water—add the powder mixed with the above-mentioned bentonite and potassium...

Embodiment 1

[0091] The raw materials of the slow and controlled release fertilizer of the present embodiment are calculated in parts by mass, including:

[0092] Urea 32, potassium chloride 16, superphosphate 20, sodium bentonite 8,

[0093] The mass percent concentration is 7% polyvinyl alcohol aqueous solution 13,

[0094] Ammonium Magnesium Phosphate 20, Sodium Polyacrylate 15, ABT3 Rooting Powder 2;

[0095] Source of materials: The above sodium-based bentonite was provided by Shandong Youso Chemical Technology Co., Ltd., product number I9310211; polyvinyl alcohol aqueous solution was provided by Wuxi Yatai United Chemical Co., Ltd., product number 1788; sodium polyacrylate was provided by Qingdao Shouke New Material Co., Ltd. , Item No. 1023; No. ABT3 root powder was provided by Beijing Zhonglin Jiacheng Technology Co., Ltd.

[0096] Among them, the particle size of urea is 1.8mm, the particle size of potassium chloride is 0.3mm, the particle size of superphosphate is 0.3mm, the pa...

Embodiment 2

[0119] The difference from Example 1 is that no rooting powder is used, and the selection and dosage of other raw materials as well as the preparation steps, operations and parameters are the same.

[0120] Adopt the same method of detection example 1, measure the release rate of its three elements in soil, the result is equivalent to embodiment 1, and tomato root system and output are less than embodiment 1.

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Abstract

The invention provides slow-controlled release fertilizer. The slow-controlled release fertilizer includes a fertilizer core, a binder and an outer coating film, wherein the fertilizer core includes chemical fertilizer and bentonite, the binder includes a polyvinyl alcohol solution, and the outer coating film also includes magnesium ammonium phosphate, super absorbent resin and rooting powder. Theraw materials of the slow-controlled release fertilizer comprise, in parts by mass, 50-85 parts of the chemical fertilizer, 5-10 parts of bentonite, 10-15 parts of the binder, 15-25 parts of magnesium ammonium phosphate, 10-20 parts of the super absorbent resin and 1-3 parts of the rooting powder, and the chemical fertilizer includes nitrogen fertilizer, potassium fertilizer and phosphorus fertilizer at a mass ratio of (25-38):(12-20):(15-24). The slow-controlled release fertilizer has a good slow-release effect.

Description

technical field [0001] The invention belongs to the technical field of slow and controlled release fertilizers, in particular to a slow and controlled release fertilizer and a preparation method thereof. Background technique [0002] my country is a fertilizer resource-constrained country, and the seasonal utilization rate of chemical fertilizers is low. Nitrogen fertilizer is about 30% to 35%, phosphorus fertilizer is about 10% to 20%, and potassium fertilizer is about 35% to 50%. The main components of fertilizers are nitrogen, phosphorus, and potassium, which need to be extracted from coal mines, phosphate rocks, and potassium mines. However, my country's mineral resources are limited, especially the annual import of potash fertilizers reaches several million tons, and the low fertilizer utilization rate causes huge waste of resources. and economic loss. In addition, the average amount of fertilizer application in my country exceeds 440kg / hm 2 , which is three times the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04
CPCC05B1/02C05G3/00
Inventor 周兆媛韩德梁赵立敏王鹤立赵欣胜李云飞
Owner MEILIGUOTU BEIJING ECOLOGICAL ENVIRONMENT ENG TECH RES INST CO LTD
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