Soil pH, organic carbon, nitrogen and phosphorus
The soil pH was determined according to the procedure of Bates
(1954). Organic matter and percentage nitrogen were determined
following the method of the Association of Official Agricultural
Chemists (AOAC, 1980). Determination of percentage nitrogen was
done first by titrating distilled digested sample and 0.02 N NaOH
and %n calculated using the formula:
%N = (A1 X 0.08 X 100) / wt of soil titre
Where A1 = titre value