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Introduction and applications of urea
2014-11-03 11:32:27
Urea is a high concentration of nitrogen fertilizer, is a neutral organic fertilizer, also can be used in the production of a variety of compound fertilizer. No residues in the soil any harmful material, long-term application of no bad influence. Animal husbandry can be used as the ruminant feed. But in the granulation temperature too high will produce a small amount of biuret, also called biuret, has inhibitory effect on crops. Our country regulation with urea fertilizer biuret content should be less than 0.5%. Biuret content exceeds 1%, cannot do seed manure, seedling weight and foliar fertilizer, the issue of the urea content in other also shoulds not be too much or too concentrated
Urea is organic nitrogen, after the soil urease, after hydrolysis of ammonium carbonate and ammonium bicarbonate, use can be absorbed by crops. Therefore, urea in crop 4 ~ 8 days before the period of fertilizer application.
Application:
Mostly used as nitrogen fertilizer in agriculture, also used as raw material in production of plastics, resins, coating, and medicine.
It is used as a surface fertilizer, alone or mixed with other fertilizers;
- it is very effective for crops with long growing seasons;
- determination on the field is based on the culture and climatic conditions and soil
- urea may be used on all soils;
- it is applied both early spring and during the vegetation.
Apply in subsoil and cover when for calcareous and alkaline soils.
Better to apply together with P K or organic fertilizers.