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The main potassium fertiliser source is potassium chloride (KCl), followed by potassium sulphate (K2SO4), and potassium and magnesium sulphate double salts (K2SO4.MgSO4). Potassium nitrate (KNO3) accounts for only 2 % of the total global potassium fertiliser consumption, expressed in K2O units (Table 1).


Table 1. Estimated global consumption of K fertilisers in 2008, expressed in millions of metric tons of product, its equivalent in millions of MT of K2O units and the relative contribution of each K fertiliser of the total K2O consumption (IFA, 2009)

K-fertiliser

Global Fertiliser Consumption

Type

% K2O

million MT product

million MT K2O

% K2O

KCl

60-62

52,0

31,2

92,0

K2SO4

50-52

3,5

1,8

5,3

KNO3

45-46

1,4

0,6

1,8

K2SO4.MgSO4

21-22

1,3

0,3

0,9

Total

33,9

100,0


 

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