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Heavy metal cadmium passivation repair slow-release urea fertilizer and preparation method thereof

A slow-release technology of urea and heavy metals, which is applied in the field of soil and environment, can solve the problems of reducing cadmium uptake, reducing the effectiveness of active cadmium, etc., and achieve the effect of preventing the increase of cadmium content, reducing the loss of nitrogen, and simple production process

Pending Publication Date: 2018-07-10
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Passivation restoration mainly refers to the addition of passivating agents to the soil. By increasing the soil pH and microporous adsorption and fixation mechanisms, the content of exchangeable cadmium in the soil is reduced, thereby reducing the uptake of cadmium by plants, thereby reducing the active cadmium. effectiveness

Method used

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  • Heavy metal cadmium passivation repair slow-release urea fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The ingredients of the cadmium passivation restoration slow-release urea special fertilizer include urea, biochemical inhibitors, and soil heavy metal cadmium passivation materials.

[0021] Based on 100 parts of urea slurry, 0.5 parts of N-butyl thiophosphoric triamide, 0.5 parts of 3,4-dimethylpyrazole phosphate and N-butyl thiophosphoric triamide and 3, 300ml of methanol with a volume concentration of 37% dissolved in 4-dimethylpyrazole phosphate, 10 parts of acid-modified biochar, 10 parts of sepiolite, 10 parts of phosphate rock powder, and 1 part of lime.

[0022] Preparation:

[0023] Based on 100 parts of urea slurry (melted urea), dissolve 0.5 part of N-butylthiophosphoric triamide and 0.5 part of 3,4-dimethylpyrazole phosphate in 300 ml of 37% methanol by volume ( As the carrier of the slow-release agent), fully mix, 10 parts of acid-modified biochar, 10 parts of acid-modified sepiolite, 10 parts of acid-modified phosphate rock powder, and 1 part of lime are ...

Embodiment 2

[0025] The ingredients of the cadmium passivation restoration slow-release urea special fertilizer include urea, biochemical inhibitors, and soil heavy metal cadmium passivation materials.

[0026] Based on 100 parts of urea slurry, 0.8 parts of thiophosphoric triamide and 1 part of 1-methylpyrazole-1 carboxamide can dissolve thiophosphoric triamide and 1-methylpyrazole-1 carboxamide 500ml of methanol with a volume concentration of 37%, and 20 parts of acid-modified biochar, 8 parts of acid-modified sepiolite, 8 parts of acid-modified phosphate rock powder, and 2 parts of lime.

[0027] Preparation:

[0028] Based on 100 parts of urea slurry (molten urea), 0.8 part of thiophosphoric triamide, 1 part of 1-methylpyrazole-1 carboxamide, dissolved in 500 ml of methanol with a volume concentration of 37% (as a sustained release agent carrier), fully mixed, 20 parts of acid-modified biochar, 8 parts of acid-modified sepiolite, 8 parts of acid-modified phosphate rock powder, and 2 p...

Embodiment 3

[0030] The ingredients of the cadmium passivation restoration slow-release urea special fertilizer include urea, biochemical inhibitors, and soil heavy metal cadmium passivation materials.

[0031] Based on 100 parts of urea slurry, mix 0.8 part of phenylphosphoric diamide, 0.5 part of 1-methylaminopyrazole, and the volume concentration that can dissolve phenylphosphoric diamide and 1-methylaminopyrazole 400mL of 37% methanol, 15 parts of acid-modified biochar, 12 parts of acid-modified sepiolite, 8 parts of acid-modified phosphate rock powder, and 1 part of lime.

[0032] Preparation:

[0033]Based on 100 parts of urea slurry (melted urea), dissolve 0.8 part of phenylphosphoric diamide and 0.5 part of 1-methylaminopyrazole in 400 mL of methanol with a volume concentration of 37% (as a carrier for a sustained release agent) , mix thoroughly, dissolve 15 parts of acid-modified biochar, 12 parts of acid-modified sepiolite, 8 parts of acid-modified phosphate rock powder, and 1 p...

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Abstract

The invention belongs to the field of soil and environment, and mainly relates to slow-release urea fertilizer comprising a heavy metal cadmium passivation agent and a preparation method. The fertilizer comprises urea, a biochemical inhibitor and a soil heavy metal cadmium passivation material according to a weight proportion of 1:0.001-0.1:0.05-0.5. The heavy metal cadmium passivation material comprises one or multiple of charcoal modified by hydrochloric acid, powdered rock phosphate modified by hydrochloric acid, sepiolite modified by hydrochloric acid and lime. Cadmium in medium-mild cadmium contaminated soil can be controlled within a reasonable range by applying the fertilizer for several times, so that cadmium absorbed by crops can be reduced, accumulative-state cadmium of the cropscan be reduced, and intake of cadmium content by people can be reduced; crop yield can be increased, and economic benefit can be increased.

Description

technical field [0001] The invention relates to the field of soil and environment, and specifically relates to a slow-release urea fertilizer that can not only passivate the heavy metal cadmium in farmland soil, but also promote the growth of crops and meet their basic nutritional requirements. Background technique [0002] Common urea fertilizers currently used in industrial and agricultural production are instant fertilizers, which dissolve and transform quickly in water and soil. After ordinary urea is applied to the soil, it is quickly converted into ammonium nitrogen under the action of urease in the soil. A large amount of ammonium nitrogen makes the soil pH rise rapidly and ammonia volatilization increases; under the condition of good ventilation, the nitrification in the soil Under the action of bacteria, nitrification will occur, and ammonium nitrogen will be converted into nitrite nitrogen and nitrate nitrogen in a short period of time. Nitrate nitrogen is easily l...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/08C05G5/00C05G3/80C05G3/90
CPCC05B17/00C05G3/80C05G3/90C05G5/12C05C9/00C05D3/02C05D9/00Y02A40/22Y02P60/21
Inventor 张丽莉于春晓武志杰杨立杰
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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