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

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...

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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 yield and quality

[0006] 1. Common chemical fertilizers such as urea are input in large amounts, resulting in waste of fertilizers and polluting water bodies and the atmosphere; 2. The fertilization period is scattered, requiring multiple top-dressing in the later period, which wastes a lot of labor and increases production costs; 3. Improper fertilization methods: fertilization for rice planting The development of mechanization in the process is slow and the level is still very low. It is still dominated by manual spreading, which has become a bottleneck in the development of mechanization in the whole process of rice production. Moreover, fertilizers are easily lost with water, and fertilizer application is scattered. The utilization rate of fertilizers is low, serious waste, and pollute water sources. and atmosphere

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