Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi
*Present address: Division of Soils & Microbiology, Jute Agricultural Research, Institute Remie Research Station, Sorbhog, Kamrup, Assam
Adsorption of urease on kaolinite, bentonite and vermiculite saturated with sodium, calcium and aluminium was studied. Relationship between clay concentration and the enzyme adsorption was linear up to a clay concentration of 40 mg/ml. Kaolinite adsorbed least amounts of urease followed by vermiculite and bentonite, which had almost same adsorption. Aluminium clays adsorbed maximum amounts of enzyme whereas calcium and sodium clays behaved almost similarly. The maximum adsorption of urease occurred at pH 6.5 for kaolinite and bentonite and at pH 7.5 for vermiculite clays.
Soil urease, clay-enzyms interaction, soil enzymes
