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Coated fertilizer for improving acidic soil and preparation method thereof

A coating and fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of low utilization rate of chemical fertilizers in the season, and achieve the effects of improving fertilizer and water retention capacity, convenient application, and increasing permeability.

Inactive Publication Date: 2018-01-16
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the seasonal utilization rate of chemical fertilizers is low (at present, the seasonal utilization rate of nitrogen fertilizer in my country is only 20% to 35%, the utilization rate of phosphorus fertilizer is 10% to 20%, and the utilization rate of potassium fertilizer is 30% to 60%), which is far lower than At the same time, a large number of chemical fertilizers have also caused a series of environmental problems such as soil acidification, salinization, compaction, and water eutrophication.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Screen 100kg of fertilizer granules with a diameter of 2-4mm, add them to the drum fluidized bed, and preheat them at 50°C. Add 4 kg of ammonium magnesium phosphate, 3 kg of sodium carboxymethyl cellulose, and 17 kg of soybean oil into the reaction kettle and stir for 2 hours at 100°C to obtain a coated homogenate, wherein the particle size of ammonium magnesium phosphate and sodium carboxymethyl cellulose is 100 head. Spray the coated homogenate evenly onto the preheated fertilizer surface. Mix 16kg of biochar powder and 4kg of palygorskite powder evenly and wrap them on the surface of the fertilizer that has been sprayed and homogenized. coated fertilizer.

Embodiment 2

[0029] Screen 100kg of fertilizer granules with a diameter of 2-4mm, add them to the drum fluidized bed, and preheat them at 60°C. Add 3 kg of ammonium magnesium phosphate, 4 kg of sodium carboxymethyl cellulose, and 15 kg of soybean oil into the reaction kettle and stir for 1 hour at 150°C to obtain a coated homogenate, wherein the particle diameters of ammonium magnesium phosphate and sodium carboxymethyl cellulose are 180 head. Spray the coated homogenate evenly onto the preheated fertilizer surface. Mix 24kg of biochar powder and 3kg of palygorskite powder evenly and wrap them on the surface of the fertilizer that has been sprayed and homogenized. coated fertilizer.

Embodiment 3

[0031] Screen 100 kg of fertilizer granules with a diameter of 2 to 4 mm, add them to the drum fluidized bed, and preheat them at 55° C. Add 2 kg of ammonium magnesium phosphate, 4 kg of sodium carboxymethyl cellulose, and 15 kg of soybean oil into the reaction kettle and stir for 2 hours at 130°C to obtain a coated homogenate, wherein the particle size of ammonium magnesium phosphate and sodium carboxymethyl cellulose is 150 head. Spray the coated homogenate evenly onto the preheated fertilizer surface. Mix 20kg of biochar powder and 4kg of palygorskite powder evenly and wrap them on the surface of the fertilizer that has been sprayed and homogenized. The particle size of biochar powder and palygorskite powder is 250 mesh, and dry to obtain a kind of fertilizer that can improve acidic soil. coated fertilizer.

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Abstract

The invention discloses coated fertilizer for improving acidic soil and a preparation method thereof. The preparation method comprises the following steps: (1) pre-heating fertilizer particles; (2) stirring and mixing ammonium magnesium phosphate, sodium carboxymethyl cellulose and oil to obtain coating homogenized paste; (3) uniformly spraying the coating homogenized paste on the surfaces of thefertilizer particles which are pre-heated in step (1); (4) after uniformly mixing biological charcoal powder and palygorskite powder, covering the mixture on the product obtained by step (3) to prepare the coated fertilizer. According to the coated fertilizer prepared by the preparation method, the fertilizer is coated with a special material, so that the aims of postponing a nutrient releasing speed and delaying the validity period of the fertilizer are realized. The coated fertilizer is convenient to apply; after the coated fertilizer is applied into soil, the fertilizer is gradually decomposed under the action of chemical and biological factors; nutrients are slowly released, and requirements of crops for the nutrients in a whole growth period can be met.

Description

technical field [0001] The invention belongs to the field of agricultural production, and more specifically relates to a coated fertilizer for improving acidic soil and a preparation method thereof. Background technique [0002] Chemical fertilizers play an important role in agricultural production, and 50% of the increase in food production in developing countries comes from the role of chemical fertilizers. However, the seasonal utilization rate of chemical fertilizers is low (at present, the seasonal utilization rate of nitrogen fertilizer in my country is only 20% to 35%, the utilization rate of phosphorus fertilizer is 10% to 20%, and the utilization rate of potassium fertilizer is 30% to 60%), which is far lower than Developed countries in the world have used advanced fertilizers, and at the same time, a large number of chemical fertilizers have also caused a series of environmental problems such as soil acidification, salinization, compaction, and water eutrophication....

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 程群鹏李建芬李红霞范国枝王春蕾
Owner WUHAN POLYTECHNIC UNIVERSITY
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