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.
NPK complex as per Fertiliser Control Order
|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|
Typical composition of DAP/NPK complex grades (by weight)
|Muriate of Potash||--||43.98||26.88|
|Filler (silica sand)||8.48||3.6||7.96|
|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|
C=12, H=1, O=16, N=14, P=31, K=39, Ca=40, S=32, C1=35.
P to P205 = 2.29; P205 to P = 0.44
K to K20 = 1.2; K20 to K= 0.83