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Di-ammonium Phosphate (DAP):
(chemical formula (NH4)2HPO4, IUPAC name di-ammonium hydrogen phosphate) is one of a series of water-soluble ammonium phosphate salts, which can be produced when ammonia reacts with phosphoric acid. DAP is used as a fertilizer. When applied as plant food, it temporarily increases the soil pH, but over a long term the treated ground becomes more acidic than before upon nitrification of the ammonium. It is incompatible with alkaline chemicals because its ammonium ion is more likely to convert to ammonia in a high-pH environment.
Specifications of DAP 18/46 Grade from GMERL:
a. Moisture percent by weight: 2.5% max
b. Total Nitrogen percent by weight: 18% min
c. Ammoniacal Nitrogen form percent by weight: 15.5% min
d. Total Urea Nitrogen in form of urea percent by weight: 2.5% max
e. Neutral ammonium citrate soluble Phosphate (as P2O5) per cent by weight: 46% min
f. Water soluble P2O5 percent by weight: 41% min
g. Physical Properties: Particle size 90% to be between1mm and 4mm IS sieve. No more than 5% shall be below 1mm size.
h. Colour: Dark brown.
Urea:
Urea is also known as carbamide, is an organic compound of carbon, nitrogen, oxygen and hydrogen, with the formula CON2H4 or (NH2)2CO. Urea is produced commercially from two raw materials, ammonia and carbon dioxide. Large quantities of carbon dioxide are produced during the manufacture of ammonia from coal or from hydrocarbons such as natural gas and petroleum derived raw materials. This allows direct synthesis of urea from these raw materials. Urea has a number of advantages over other nitrogen fertilizers. Urea is safer to ship and handle, it is less corrosive to equipment, it has a higher analysis than any other dry nitrogen fertilizer and it can be used on virtually all crops. Urea can be stored and distributed through conventional systems. It can be applied in many different ways from sophisticated aerial application equipment to a farm spreading urea by hand. Urea is also highly water soluble so it moves readily into the soil. The high analysis means a reduced transportation and application cost per kilogram of nitrogen.

Specifications of Urea 46% N Grade from GMERL:
Total Nitrogen percent by weight: 46% min
Biuret: 1.0% max
Moisture percent by weight: 1.5% max
Size 2.0-4.0 mm: 90% min
Granular/Prilled form, white colour, free flowing, free from harmful substances.