Page 131 - Enzymes in Tropical Soils

Enzymes in Tropical Soils 119

Chapter VIII:

EFFECTS OF NUTRIENT ELEMENTS ON

SOIL ENZYMES

8.1 Effects of Mass Action Law
8.2 Effects of P on the Activity of Phosphatases
8.3 Effects of S on the Activity of Arylsulphatase
8.4 Effects of Other Elements on the Activities of Soil Enzymes

S
oil water is composed of various ions and molecules that may conduct
physical or chemical interactions with soil solids. These interactions may
fasten or hinder the chemical and/or the biochemical reactions. In a
particular case, the presence of a particular ion or molecule involved as a
+
reactant may fasten the reaction. For example, the presence of H ions may fasten
the weathering of Albit (Eq. 8.1). Conversely, in other cases, the presence of
another ion or molecule as a reaction product may hinder the progress of a
reaction. For example, the presence of increasing concentration of ortophosphates
released by P-fertilizers is reported to hinder the decomposition of organic P (Eq.

Abdul Kadir Salam - 2014