Film-coated slow-released fertilizer and preparation process thereof

A technology of coated slow-release fertilizers, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve problems such as high prices, environmental stress, and complicated manufacturing processes
CN1211320CInactive Publication Date: 2005-07-20NANJING UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV
Publication Date
2005-07-20
Estimated Expiration
Not applicable · inactive patent

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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 with a 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 solvent is 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.
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Description

technical field

[0001] The invention relates to a slow-release fertilizer and a preparation method thereof, in particular to a novel environment-friendly film-coated slow-release fertilizer and a preparation method thereof. Background technique

[0002] The dependence of crop growth on nutrients is a spontaneous natural process. Fertilizer is one of the most important means of production in agricultural production and the material basis for crops to exert their maximum genetic potential. The rise of the fertilizer industry has had an extremely profound impact on human existence. Chemical fertilizers have played an immeasurable role in promoting the rapid development of agriculture, agronomy, animal husbandry, and aquaculture by replacing farmyard manure. In recent years, with the rapid increase of population and the decrease of arable land, the contradiction between food supply and demand has been intensified, making agricultural production increasingly dependent on fertiliz...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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