NPK

An integral part of a farmer’s quest for nurturing mother Earth

NPK complex fertilisers produced at Kandla are DAP based grades. At present two grades Grade I - 10:26:26 and Grade II - 12:32:16 are produced.

Granular NPK complexes are free flowing and do not pose any problem during handling and storage. However, exposure of material for long period to very high humidity may cause caking. Therefore, NPK complexes are bagged in quality tested HDPE bags to prevent ingress of moisture.

Technical specifications:

NPK complex Fertiliser specifications as FCO

Particulars NPK-10:26:26 NPK-12:32:16 Zincated-NPK-12:32:16
Moisture % by weight, maximum 1.5 1.5 1.5
Total N % by weight, minimum 10.0 12.0 12.0
Ammoniacal N % by weight, minimum 7.0 9.0 9.0
Available phosphorus (as P 2 O 5 ) % by weight, minimum 26.0 32.0 32.0
Water soluble phosphates (as P2O5) % by weight, minimum 22.1 27.2 27.5
Water soluble potash (as K2O) % by weight, minimum 26.0 16.0 16.0
Zinc (as Zn) per cent by weight, minimum - - 0.5
Particle size Minimum 90 percent of the material shall be retained between 1mm and 4 mm IS sieve.

Ammonium Phosphate Sulphate (20-20- 0-13) specifications as per FCO

Moisture % by weight, maximum 1.0
Total Nitrogen (ammoniacal + urea), percent by weight, minimum 20.0
Ammoniacal Nitrogen, percent by weight, minimum 18.0
Available phosphorus (as P 2 O 5 ) % by weight, minimum 20.0
Water soluble phosphorus (as P 2 O 5 ), percent by weight, minimum 17.0
Sulphate Sulphur (as S), percent by weight minimum 13.0
Particle size Minimum 90 percent of the material shall be retained between 1mm and 4 mm IS sieve.

Typical composition of DAP/NPK complex grades (by weight)

 Particulars DAP NPK-10:26:26 NPK-12:32:16
Moisture 0.9 0.88 0.85
Diammonium phosphate 87.53 50.04 62.68
Muriate of Potash -- 43.98 26.88
Urea 3.09 1.5 1.63
Filler (silica sand) 8.48 3.6 7.96

Secondary/micro nutrients

Particulars  DAP NPK-10:26:26 NPK-12:32:16
Sulphur as S 0.48 0.88 0.66
Iron as Fe 0.31 0.4 0.25
Aluminium as AI 0.32 0.52 0.18
Calcium as Ca 0.12 0.11 0.09
Magnesium as Mg 0.26 0.34 0.31
Zinc as Zn (ppm) 103 98 88
Copper as Cu 55 32 27

Atomic weight

C=12, H=1, O=16, N=14, P=31, K=39, Ca=40, S=32, Cl=35.

Conversion factors

P to P2O5 = 2.29;P2O5 to P = 0.44

K to K2O = 1.2;K2O to K= 0.83