Ammonium was extracted with 1 M KCl afterwashing the samples free of excess salt and determined photometrically using a continuous flow auto analyzer (Skalar Analytical B.V., Breda, The Netherlands).
Ammonium was extracted with 1 M KClafterwashing the samples free of excess salt and determined photometricallyusing a continuous flow auto analyzer (Skalar Analytical B.V.,Breda, The Netherlands).