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 as per Fertiliser Control Order

  NPK-10:26:26 NPK-12:32:16
Moisture % by weight, maximum 1 1
Total N % by weight, minimum 10 12
Ammoniacal N % by weight, minimum 7 9
N in the form of urea, % by weight, maximum 3 3
Neutral ammonium citrate soluble phosphates (as P2O5) % by weight, minimum 26 32
Water soluble phosphates (as P2O5) % by weight, minimum 22.1 27.2
Water soluble potash (as K2O) % by weight, minimum 26 16
Particle size    

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

  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

  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, C1=35.

Conversion factors

P to P205 = 2.29; P205 to P = 0.44

K to K20 = 1.2; K20 to K= 0.83