Film-coated slow-released fertilizer and preparation process thereof

Abstract

The present invention relates to a coated granular slowly-releasing fertilizer and its preparation method. It is characterized by that the surface of the nitrogen granular fertilizer is covered witha layer of coated film, and said coated film is formed from nitro-cotton and tung oil as dry oil additive, and the coated film is 5%-30% of total weight and added quantity of tung oil is 0-20% of coated film weight. Its preparation method includes the following steps: dissolving the cellulose compound and its derivative for example nitro-cotton in solvent to obtain covering solution, said solventis ethyl alcohol and ethyl ether mixed solution, then coating surface of granular fertilizer with said covering solution, finally recovering solvent so as to obtain the invented coated granjlar slowly-releasing fertilizer.

Description

Technical field [0001] The invention relates to a slow-release fertilizer and a preparation method thereof, in particular to a novel environmentally-friendly coated slow-release fertilizer and a preparation method thereof. Background technique [0002] The dependence of crop growth on nutrients is a spontaneous natural process. Fertilizers are one of the most important means of production for agricultural production and the material basis for crops to exert their greatest genetic potential. The rise of the fertilizer industry has a profound impact on human survival. The replacement of farmyard manure by chemical fertilizers has played an immeasurable role in the rapid development of agriculture, agronomy, animal husbandry, and aquaculture. In recent years, with the rapid increase in population and the reduction of arable land, the contradiction between food supply and demand has intensified, making agricultural production increasingly dependent on fertilizers. All this highlights...

AI Technical Summary

Problems solved by technology

[0015] ① Expensive price: Due to its complex manufacturing process and relatively fine requirements, the amount of polymer materials added is relatively high, which is 10-15%, making its price 3-9 times that of ordinary fertilizers. Even in economically developed countries, it is difficult to bear;

[0016] ②Environmental stress: Taking Nutricote as an example again, the polymer material used in it will take 30 years to degrade, and the components of the coating material account for 10-15% of the total amount of the coating fertilizer. Long-term use will inevitably bring serious environmental consequences

[0019] ① For crops, it is often difficult to meet the needs of the early peak period of fertilizer absorption;

[0020] ② Some varieties (such as polymer-coated fertilizers) are too expensive to meet the needs of field crops, so they are mostly used in horticultural crops (fruit trees) and other perennial ornamental crops;

[0021] ③ Some excellent slow-release varieties are still difficult to meet the needs of the environment, especially sustainable development

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