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Preparation method of granular urea applicable to paddy rice top application and containing humic acid synergistic carrier

A granular urea and humic acid technology, applied in urea compound fertilizer, nitrogen fertilizer, magnesium fertilizer, etc., can solve the problem of no humic acid urea

Inactive Publication Date: 2019-01-18
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no patent applications and related materials for humic acid urea suitable for rice topdressing

Method used

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  • Preparation method of granular urea applicable to paddy rice top application and containing humic acid synergistic carrier

Examples

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Comparison scheme
Effect test

Embodiment 1

[0072] Example 1: Preparation of granular urea containing humic acid synergistic carrier suitable for rice topdressing

[0073] The implementation steps of this embodiment are as follows:

[0074] A, preparation of humic acid extractant

[0075] Add 4 parts by weight of potassium salicylate and 3.0 parts by weight of dimethylformamide to 200 parts by weight of water at a temperature of 64°C, stir and dissolve at 180 rpm, and cool the obtained solution to a temperature below 40°C to obtain the humic acid extractant;

[0076] B, preparation of humic acid extract

[0077] Add 100 parts by weight of weathered coal humic acid mineral raw material with a particle size of 150 meshes to 1000 parts by weight of the humic acid extractant obtained in step A, then gradually raise its temperature to 90°C under stirring, and keep it at this temperature for 54min , then cooled to room temperature, centrifuged at 1000rpm for 50min, and the precipitate was discarded to obtain the humic acid...

Embodiment 2

[0084] Example 2: Preparation of Granular Urea Containing Humic Acid Synergistic Carrier Suitable for Rice Topdressing

[0085] The implementation steps of this embodiment are as follows:

[0086] A, preparation of humic acid extractant

[0087] Add 5 parts by weight of potassium salicylate and 2.4 parts by weight of dimethylformamide to 140 parts by weight of water at a temperature of 70°C, stir and dissolve at 60 rpm, and cool the obtained solution to a temperature below 40°C to obtain the humic acid extractant;

[0088] B, preparation of humic acid extract

[0089] Add 100 parts by weight of lignite humic acid mineral raw material with a particle size of 300 meshes to 1500 parts by weight of the humic acid extractant obtained in step A, then gradually raise its temperature to 90°C under stirring, and keep it at this temperature for 40min, Then cooled to room temperature, centrifuged at 3500rpm for 24min, and the precipitate was discarded to obtain the humic acid extract;...

Embodiment 3

[0096] Example 3: Preparation of granular urea containing humic acid synergistic carrier suitable for rice topdressing

[0097] The implementation steps of this embodiment are as follows:

[0098] A, preparation of humic acid extractant

[0099] Add 2 parts by weight of potassium salicylate and 1.6 parts by weight of dimethylformamide to 170 parts by weight of water at a temperature of 60°C, stir and dissolve at 120 rpm, and cool the obtained solution to a temperature below 40°C to obtain the humic acid extractant;

[0100] B, preparation of humic acid extract

[0101] Add 100 parts by weight of weathered coal humic acid mineral raw material with a particle size of 200 meshes to 1200 parts by weight of the humic acid extractant obtained in step A, then gradually raise its temperature to 90°C under stirring, and keep it at this temperature for 48min , then cooled to room temperature, centrifuged at 1600rpm for 36min, and the precipitate was discarded to obtain the humic acid...

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Abstract

The invention relates to a preparation method of granular urea applicable to paddy rice top application and containing a humic acid synergistic carrier. The preparation method comprises the steps of preparing a humic acid extracting agent, preparing a humic acid extracting solution, preparing a chelated magnesium-zinc-boron solution, preparing the humic acid synergistic carrier, preparing the granular urea containing the humic acid synergistic carrier and the like. The granular urea containing the humic acid synergistic carrier has the advantage that the pH of the soil with the fertilizer of 1cm of the granular urea can be improved by 0.4 to 1 unit and the urease activity is improved by 13 to 48 percent. Compared with commercial urea, the granular urea containing the humic acid synergistic carrier has the advantage that the yield of paddy rice is averagely improved by 8.1 percent and the utilization rate of nitrogen fertilizer is improved by 8 percentage points.

Description

【Technical field】 [0001] The invention relates to the technical field of fertilizer production. More specifically, the present invention relates to a method for preparing granular urea containing a humic acid synergistic carrier suitable for rice topdressing. 【Background technique】 [0002] Urea is the most important nitrogen fertilizer variety in my country, and improving its utilization rate is crucial to increasing yield, saving resources and protecting the environment. Urea needs to be converted into ammonium nitrogen and nitrate nitrogen before it can be absorbed and utilized by crops. Rice is the largest food crop in my country, and belongs to ammonium-loving crops. Rice topdressing in southern China is based on low soil pH, low urease activity, and slow conversion of urea to ammonium nitrogen, which cannot meet the requirements of ammonium nitrogen during the critical growth period of rice. demand. Urea is non-polar, and it is easy to move out of the root layer or s...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/08C05G5/00C05G3/80C05G3/90
CPCC05C9/00C05G3/80C05G3/90C05G5/12C05D5/00C05F11/00C05F11/02C05G3/00
Inventor 赵秉强袁亮李燕婷林治安张水勤王薇
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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