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Preparation method of alginic acid synergistic carrier for urea suitable for rice topdressing

A technology of alginic acid and carrier, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, magnesium fertilizer, etc., and can solve the problems of unseen alginic acid synergistic carrier for urea

Inactive Publication Date: 2019-01-25
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 is no patent application and relevant information on the alginic acid synergistic carrier for urea suitable for rice topdressing

Method used

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  • Preparation method of alginic acid synergistic carrier for urea suitable for rice topdressing
  • Preparation method of alginic acid synergistic carrier for urea suitable for rice topdressing
  • Preparation method of alginic acid synergistic carrier for urea suitable for rice topdressing

Examples

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Effect test

Embodiment 1

[0073] Example 1: Preparation of urea suitable for rice topdressing with alginic acid synergistic carrier

[0074] The implementation steps of this embodiment are as follows:

[0075] A, preparation of alginic acid extractant

[0076] 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 a speed of 180 rpm, and cool the obtained solution to a temperature below 35°C to obtain the obtained The alginic acid extractant described above;

[0077] B. Preparation of alginic acid extract

[0078] Add 100 parts by weight of kelp brown algae powder raw material with a particle size of less than 2mm to 1000 parts by weight of the alginic acid extractant obtained in step A, then gradually raise its temperature to 90 ° C under stirring at a speed of 180 rpm, and at this temperature Keep for 10 hours, then cool to room temperature, centrifuge at 1000 rpm for 26 minutes, disc...

Embodiment 2

[0083] Example 2: Preparation of urea suitable for rice topdressing with alginic acid synergistic carrier

[0084] The implementation steps of this embodiment are as follows:

[0085] A, preparation of alginic acid extractant

[0086]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 a speed of 60 rpm, and cool the obtained solution to a temperature below 35°C to obtain the obtained The alginic acid extractant described above;

[0087] B. Preparation of alginic acid extract

[0088] Add 100 parts by weight of macroalgae powder with a particle size of less than 2mm to 800 parts by weight of the alginic acid extractant obtained in step A, then gradually increase its temperature to 70°C under stirring at a speed of 100rpm, and at this temperature Keep for 8 hours, then cool to room temperature, centrifuge for 5 minutes at a rotational speed of 2400 rpm, discar...

Embodiment 3

[0093] Example 3: Preparation of urea suitable for rice topdressing with alginic acid synergistic carrier

[0094] The implementation steps of this embodiment are as follows:

[0095] A, preparation of alginic acid extractant

[0096] 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 a speed of 120 rpm, and cool the obtained solution to a temperature below 35°C to obtain the obtained The alginic acid extractant described above;

[0097] B. Preparation of alginic acid extract

[0098] Add 100 parts by weight of Ascophyllum nodosum powder raw material with a particle size of less than 2mm to 1500 parts by weight of the alginic acid extractant obtained in step A, then gradually raise its temperature to 80°C under stirring at a speed of 200rpm, and at this temperature Keep it under high temperature for 12 hours, then cool to room temperature, centrifuge for 40...

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Abstract

The invention relates to a preparation method of an alginic acid synergistic carrier for urea suitable for rice topdressing. The preparation method comprises the steps of preparation of an alginic acid extractant, preparation of an alginic acid extracting solution, preparation of the alginic acid synergistic carrier and the like. After the alginic acid synergistic carrier is combined with the urea, the pH value of 1-centimeter fertisphere soil of granular urea can be significantly improved by 0.4-1.0 unit, and the urease activity is averagely improved by 30.8%. The fresh weight and activity ofrice root systems are averagely improved by 28.4% and 37.5% respectively compared with contrasts, alginic acid urea is compared with commercially available urea, the rice yield is improved by 10.4%,the utilization rate of a nitrogenous fertilizer is improved by 7.7%, and a new idea is provided for improving the urea and nitrogenous fertilizer of rice topdressing in southern China.

Description

【Technical field】 [0001] The invention belongs to the technical field of fertilizer production. More specifically, the present invention relates to a method for preparing an alginic acid synergistic carrier suitable for topdressing rice. 【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 surface runoff with irr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05C9/00C05D5/00C05G3/00C05D9/02C05F11/00
Inventor 袁亮赵秉强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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