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Table 1 Arsenic content of the synthetic and natural fertilizers available in Sri Lanka

From: Phosphate fertilizer is a main source of arsenic in areas affected with chronic kidney disease of unknown etiology in Sri Lanka

Type of fertilizer No of samples Range of as content (mg/kg) Mean as content (mg/kg) Imported quantity in 2012 (MT)
TSP*+ 17 25.49-37.86 31.00 108229
Eppawala rock phosphate 15 3.4-21.81 8.56 PP
Dolamite 15 6.01-7.61 6.58 PP
NPK mixture# 15 1.95-7.28 5.88 4879
Urea*+ 18 0.88-1.09 0.92 302831
Ammonium sulphate* 10 0.71-1.21 0.94 77199
Cattle manure mix 18 0.76-1.02 0.84 PP
MOP*+ 18 ND-1.02 0.44 111855
Compost 20 ND-1.34 0.41 PP
Chicken manure 18 0.25-0.72 0.38 PP
Liquid fertilizer# 15 ND-0.65 0.33 241222
Paddy husk charcoal 16 ND-0.23 0.10 PP
Coir dust 16 ND 0.00 PP
Wood charcoal 15 ND 0.00 PP
  1. PP Purchased and produced in Sri Lanka. *The government imports and heavily subsidizes these fertilizers. +mainly used in rice cultivation #Imported by private sector and not used in paddy cultivation.