Controlled-release coated urea special for super grain rice and preparation method thereof

A technology of granular urea and special packaging, which is applied in the field of super-large granular rice special-coated controlled-release urea and its preparation, which can solve the problems of affecting crop root growth, improper fertilization methods, reducing crop yield and quality, etc., and achieve improved soil nutrient levels , save labor input, improve the effect of soil and water

Inactive Publication Date: 2017-04-26
SHANDONG AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although a large amount of chemical fertilizers has ensured the stable growth of my country's grain production, at the same time, the harm has already appeared: 1. The utilization rate of chemical fertilizers in China is low in the current season, and nitrogen fertilizer is only 15-35%. The level of fertilizer utilization rate has entered the international recognition 2. A large amount of nitrogen fertilizer is applied in the process of agricultural production, resulting in nitrogen enrichment in surface water, causing eutrophication of water body; and a large amount of greenhouse gases volatilize into The atmosphere exacerbates the greenhouse effect
3. The soil begins to harden and acidify, which makes the soil's ability to retain water and nutrients worse, affects the growth of crop roots, and reduces crop yie

Method used

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  • Controlled-release coated urea special for super grain rice and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First mix the granular or powdered urea raw material and the activated humic acid accounting for 5% of the mass ratio to obtain the urea raw material A; extrude the urea raw material A with an extruder under a pressure of 10T to form super-large granular spherical urea B, and the weight of B is Within the scope of 3g ± 0.1g, the diameter is 30mm; then use the coating material C to face the urea particle coating on the fluid bed (the components of the coating material are by weight ratio: castor oil 14.4%, elastomer polyether polyol 35% , polyphenylcyanate 50%, carbon nanotube 1‰, nano-silicon dioxide 5‰), the coating material C which accounts for 1% by weight of the fertilizer D is fully mixed with the fertilizer on the fluid bed until it solidifies Take out the urea fertilizer to obtain super-large-grain rice-coated controlled-release urea D; after weighing, the weight of the fertilizer increases by 0.9%-1%, which is the amount of its coating. Let it stand for 24 hours ...

Embodiment 2

[0030] First mix the granular or powdered urea raw material with its mass of 3% activated humic acid to obtain urea raw material A; extrude the urea raw material A with an extruder under a pressure of 6T to form super-large granular spherical urea B, and the weight of B is 2g±0.1 In the range of g, the diameter is 20mm, then use castor oil 20% by weight, elastomer polyether polyol 34.6%, polyphenylcyanate 45%, carbon nanotube 2‰ and nano silicon dioxide 2‰ As the coating material C to B coating, the coating material C accounting for 1.5% by weight of urea fertilizer B is fully mixed on the fluid bed until it is solidified, and then the urea fertilizer is taken out, that is, the special coating controlled release of super-large grain rice is obtained Urea D: After weighing, the mass ratio of urea fertilizer D increases by 1.4%-1.5%, which is its coating amount. Let it stand for 24 hours until it is completely solidified to measure the fertilizer release rate. The release period ...

Embodiment 3

[0032]First mix the granular or powdered urea raw material with 1% activated humic acid of urea quality to obtain urea raw material A; extrude the urea raw material A with an extruder under a pressure of 2T to form super-large spherical urea B, and the weight of B is 1g± In the range of 0.1g, the diameter is 10mm, then use the amount of castor oil 24.3% by weight, elastomer polyether polyol 20%, polyphenylcyanate 55%, carbon nanotube 3‰ and nano silicon dioxide 4‰ as the coating material C to B coating, the coating material C accounting for 0.5% by weight of urea fertilizer B is fully mixed on the fluid bed until it is solidified, and then the urea fertilizer is taken out to obtain a special coating for super-large grain rice Controlled-release urea D: After weighing, the mass ratio of urea fertilizer increases by 0.4%-0.5%, which is its coating amount, and it is allowed to stand for 24 hours until it is completely solidified to measure the fertilizer release rate, and the rele...

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Abstract

The invention relates to controlled-release coated urea special for super grain rice. A preparation method comprises the steps that activated humic acid powder is uniformly mixed into urea to serve as a raw material A of super grain rice urea, the raw material A is pressed with an extruder under the extrusion pressure of 1-10 T to form spherical super grain urea B; carbon nano tube modified castor oil polyurethane serves as a coated material C to be sprayed to the outer surface of the spherical super grain urea B, and the coated urea D special for the super grain rice is obtained, that is to say, the controlled-release coated urea special for the super grain rice is obtained; the sum of the weight ratio of the spherical super grain urea B and the coated material C is 100%; the release period is 3-5 months, a traditional nitrogenous fertilizer application mode of the rice can be effectively changed, and 50% of application amount is saved compared with ordinary urea; the fertilizer can be applied into soil at a fixed site, mechanized operation is convenient, and the controlled-release coated urea has the advantages of saving labor and time.

Description

[0001] (1) Technical field [0002] The invention relates to a special-coated controlled-release urea for super-large grain rice and a preparation method thereof, belonging to the field of new fertilizer production [0003] (2) Background technology [0004] Although a large amount of chemical fertilizers has ensured the stable growth of my country's grain production, at the same time, the harm has already appeared: 1. The utilization rate of chemical fertilizers in China is low in the current season, and nitrogen fertilizer is only 15-35%. The level of fertilizer utilization rate has entered the international recognition 2. A large amount of nitrogen fertilizer is applied in the process of agricultural production, resulting in nitrogen enrichment in surface water, causing eutrophication of water body; and a large amount of greenhouse gases volatilize into The atmosphere exacerbates the greenhouse effect. 3. The soil begins to harden and acidify, which makes the soil's ability t...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05C9/00C05G3/80C05G5/12C05G5/30C05F11/02
Inventor 杨越超刘路
Owner SHANDONG AGRICULTURAL UNIVERSITY
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