Page 214 - Enzymes in Tropical Soils

202 Enzymes In Tropical Soils

Soil Enzyme is a catalyst that accelerate the transformation of elements in organic
matter not available for plant root absorption to inorganic elements easily
absorbed by plant roots.

Sulfur Cycle or S-Cycle is the chain of all the processes of S transformation from
2-
SO 4 in soil solution absorbed by plant roots and its transformation to be
structural and functional substances like proteins in plant tissues and
microorganisms, and then their ultimate decomposition back to form
2-
inorganic SO 4 available to plants.
Urease is an organic substance produced by microorganisms, earthworms, or plant
roots acting as a biocatalyst functioning to accelerate the detachment of N
from Urea to form NH 3 .
Urease Inhibitor is an organic or inorganic compound that may inhibit the work of
Urease so that the hydrolysis of urea and, hence, the production of NH 3 is
limited.

Weathering is a physical or chemical or biological destruction of soil mineral
structure resulting in a new and more simple minerals. In chemical
weathering, some inorganic elements are freed and are available to plants.
For example, during the chemical weathering of feldspars in the presence of
+
+
H ions and H 2 O molecule, K ions are freed to be available for plants.

Abdul Kadir Salam - 2014