Novel controlled-release rice topdressing composition and preparation method thereof

Abstract

The invention relates to a novel controlled-release rice topdressing composition prepared by using a controlled-release fertilizer technology and a preparation method of the novel controlled-release rice topdressing composition. The composition comprises the following components in percentage by weight: 10-70% of a nitrogen fertilizer, 0-30% of a granular phosphate fertilizer, 0-30% of a granular potassium fertilizer, 0-2% of granular zinc sulfate, 0-1% of granular boron, 10-90% of anti-floating resin urea with the release period of 20-140 days and content of N larger than or equal to 42% and 0-20% of anti-floating resin potassium chloride with the release period of 60-120 days and content of K larger than or equal to 56%. The invention also relates to the preparation method of the composition. The novel controlled-release rice topdressing composition disclosed by the invention has a unique formula and can be used for effectively reducing rice topdressing frequency and reducing the topdressing cost; and secondary topdressing is not needed, primary topdressing is realized, and the novel controlled-release rice topdressing composition has remarkable using effects and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of slow-release fertilizers, and in particular relates to a novel slow-release rice topdressing fertilizer composition and a preparation method thereof. Background technique [0002] As the source of nutrients needed for crop growth, chemical fertilizers use only about 35% of their fertilizers. Therefore, improving fertilizer use efficiency is of great significance for reducing environmental pollution. In recent years, new types of fertilizers have received widespread attention. Compared with conventional fertilizers, slow and controlled release fertilizers can automatically adjust the release of nutrients according to the needs of crops, that is, they will not release insufficient nutrients to cause plant nutrient deficiency, and will not release excessive nutrients to cause nutrient loss and waste. It improves the utilization rate of chemical fertilizers and reduces the amount of fertilizers; it can fu...

AI Technical Summary

Problems solved by technology

Although the traditional fertilization method has certain advantages, the disadvantages of this method are also very obvious.

The traditional method of fertilization has the following disadvantages: more times of topdressing, high cost input, high labor intensity, and easy to pollute the environment

However, this fertilizer is applied as a base fertilizer at one time. Although it has a slow and controlled release effect, the coating of conventional sulfur-coated fertilizers is prone to cracks due to poor coating quality or uneven coating, which affects the slow-release effect, and the release period is not long. Precise, short release period, easy to release too much fertilizer in the early stage, insufficient fertilizer in the later stage, cannot meet the one-time fertilization, and topdressing fertilizer is needed, and the promotion of this technology in my country has basically failed; in addition, the fertilizer disclosed in this patent belongs to base fertilizer, and Non top dressing

[0005] In addition, the Chinese patent document CN104945090A (201510297783.9) discloses a rice fertilizer that can effectively increase yield. Acid 5-30, trace elements, activators, water, and additives are combined. Although it can effectively increase the yield of rice, the fertilizer disclosed in this patent is not a slow-release fertilizer and cannot solve the problem of one-time topdressing in the whole process.

[0006] The applicant also found that the Chinese patent document CN101177367A (200710113496.3) disclosed a special controlled-release fertilizer for rice, which compounded thermoplastic resin-coated urea, sulfur-coated urea, potassium chloride compound fertilizer, potassium chloride and zinc sulfate to form rice Special controlled-release fertilizer, 25-35% of the quick-acting nitrogen fertilizer in the formula is for absorption from transplanting to tillering stage, 55-65% of sulfur-coated urea is for nitrogen nutrition from panicle differentiation to heading stage, and 10% urea nutrition is for rice It can be used in the later stage of growth; however, the fertilizer disclosed in this patent is rice base fertilizer and cannot be used as top dressing for rice. The amount of fertilizer applied in this patent is large, and more than 50 kg per mu is required, and the cost of use is relatively high; in addition, the fertilizer in this patent belongs to base fertilizer , does not belong to topdressing

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