Nitrogen coated slow release fertilizer

Abstract

The invention discloses a nitrogenous envelope slowed release fertilizer, which comprises a fertilizer core and an envelope outside the fertilizer core; the envelope is an amino resin envelope; fertilizer-resistance inorganic padding with the grain diameters equal to or less than 3 microns are wrapped on the surface of the envelope; wherein, the amino resin can be urea formaldehyde resin and / or melamine resin. The fertilizer-resistance inorganic padding wrapped on the surface of the envelope are better to be nano padding with the grain diameters equal to or less than 1 micron, and can be one or more than one of nano calcium carbonate, white carbon black and nano carbon black. The wrapped (nano) fertilizer-resistance inorganic padding can comprise fertilizer-permeable padding and / or the fertilizer-resistance inorganic padding with the grain diameters more than 3 microns. The fertilizer-permeable padding can be one or more than one of natural organic powder, clay powder, water-soluble grains, and the like. The thickness of the envelope is better to be between 50 and 220 mu m. The organic envelope body of the slowed release fertilizer is harmless to the environment, and is a nutriment in a fertilizer, with low cost and long and adjustable release period.

Description

1. Technical field [0001] The invention relates to a film-coated slow-release chemical fertilizer, in particular to a nitrogen film-coated slow-release chemical fertilizer, which belongs to the field of chemical fertilizer industry. 2. Background technology [0002] Slow-release chemical fertilizers meet the requirements of environmental protection and sustainable social development, and will become the mainstream of agricultural chemical fertilizers in the future and the development direction of agricultural chemical fertilizers in the world. However, most of the coatings of slow-release chemical fertilizer products cannot be degraded, such as epoxy resin, polyurethane, polyethylene, polypropylene, polyvinyl chloride and other coatings will remain in the soil and pollute the environment, especially the coatings are mostly not fertilizers, so now Organic coatings of slow-release fertilizer products are substances that are not useful to crops. The development of nitrogen-coa...

AI Technical Summary

Problems solved by technology

However, most of the coatings of slow-release chemical fertilizer products cannot be degraded, such as epoxy resin, polyurethane, polyethylene, polypropylene, polyvinyl chloride and other coatings will remain in the soil and pollute the environment, especially the coatings are mostly not fertilizers, so now Organic coatings of slow-release fertilizer products are useless to crops

The development of nitrogen-coated slow-release fertilizers is a good expectation in the field of coated slow-release fertilizers. However, the release period of nitrogen-coated slow-release fertilizers is relatively short (for example, the release period is very short when amino resin-coated fertilizers are purely used). , for example, when the thickness of the coating is about 200 μm and soaked in water at about 25°C, the fertilizer core will be completely dissolved in only a few days), so good practical application effects cannot be obtained or the practical surface is too narrow

Images