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Some knowledge of urea
2014-10-30 13:23:46
Ammonia and carbon dioxide(CO2) acid gas are synthesized directly to produce urea. It is prilled in form without any odor or color and slightly hygroscopic. Urea is mainly used for chemical fertilizer such as solo ingredient of nitrogen fertilizer as is ammonium sulphate and ingredient of mixed fertilizer or slow-release nitrogen fertilizer. Dilute urea liquid can be sprayed on leaves as fertilizer and put a little amount into feed for chewers. In addition, it is of wide use of industrial purpose such as plastic, dyeing, medicines and organic synthesis. Urea and melamine can be used either separately or as condensation resin for molding compound, adhesive material, paint, textile-processing and paper converting. By impregnating printing paper with melamine and applying heat and pressure, melamine resin decorated sheet can be produced, which offers great resistance to water and heat and has various uses.
Uses of urea
1.Urea as a fertilizer can be applied to the soil and is also suitable for spraying on the leaf
2.Spraying on the leaf is applicable to all kinds of crops.The appropriate concertration is between 0.2% to 2.0%,depending on the crop species and growth period.For leaf spraying,it is important to note that minor component biuret test result is lower than 0.5%
3.Urea is not fit for seed manure because of high nitrogen content and may result to buring the seedings.Some urea which contains certain amount of biuret may also be toxic to the seeding.