Urea

Urea is the most important nitrogenous fertiliser in the country because of its high N content (46%N). Besides its use in the crops, it is used as a cattle feed supplement to replace a part of protein requirements. It has also numerous industrial uses notably for production of plastics.Although urea often offers farmers the most nitrogen for the lowest price on the market, special steps must be taken when applying urea to the soil to prevent the loss of nitrogen through a chemical reaction.

About Urea

Urea is the most important nitrogenous fertiliser in the country because of its high N content (46%N). Besides its use in the crops, it is used as a cattle feed supplement to replace a part of protein requirements. It has also numerous industrial uses notably for production of plastics. Presently all the Urea manufactured in the country is Neen coated.

Technical specifications:

Specification of Neem Coated Urea as per Fertiliser Control Order

Moisture % by weight, maximum 1.0
Total N % by weight (on dry basis) minimum 46.0
Biuret % by weight, maximum 1.5
Particle size Minimum 90% of the material be retained on 1 mm and 2.8 mm IS sieve.
Neem oil content soluble in Benzene, % by weight, mimimum 0.035

If urea is applied to bare soil surface significant quantities of ammonia may be lost by volatilisation because of its rapid hydrolysis to ammonium carbonate. The hydrolysis of urea can be altered by the use of several compound called urease inhibitors. These inhibitors inactivate the enzyme and thereby prevent the rapid hydrolysis of urea when it is added to soil. The rapid hydrolysis of urea in soils is also responsible for ammonia injury to seedlings if large quantities of this material placed with or too close to the seed. Proper placement of fertiliser urea with respect to seed can eliminate this difficulty.