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Acidity and Basicity of Fertilizers

Submitted by JAI VIR SINGH on Fri, 29/01/2010 - 13:06
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Acidity and Basicity of Fertilizers


Equivalent Acidity: The amount of CaCO3 required to neutralise the acid residues caused by acidic fertilizers in the soil e.g. 100 kg (NH4)2SO4 produces acidity which needs 110 kg of CaCO3 to neutralise it. Therefore equivalent acidity of (NH4)2SO4 is 110; Anhydrous NH3 has more equivalent acidity than other fertilizers.

Equivalent Basicity: Residual basicity caused by application of basic fertilizers, expressed in terms of CaCO3 equivalent of basic residues left by a fertilizer material (in kg/100 kg of fertilizer salt).

 

S. No.  

Fertilizer

Equivalent Acidity

Equivalent Basicity

1.     

CaCN

-

63

2.     

NaNO3

-

29

3.     

KNO3

-

29

4.     

Ca(NO3)2

-

21

5.     

Nitrate of Soda Potash

-

26

6.     

Anhydrous Ammonia

148

-

7.     

NH4Cl

128

-

8.     

(NH4)2SO4

110

-

9.     

(NH4)2SO4.NH4 NO3

93

-

10.                        

Urea

80-84

-

11.                        

DAP

77

-

12.                        

Ammonium Nitrate

60

-

13.                        

Mono-ammonium Phosphate

55

-
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Please note that this is the opinion of the author and is Not Certified by ICAR or any of its authorised agents.