Urease activity in some Trinidad soils

The effects of urea concentration, soil moisture content, period of storage of soil samples, temperature and toluene on the urease activity of fifteen Trinidad soils were investigated. From the multiple regression analysis of clay content, organic carbon, CEC and amorphous Fe and Al and the urease activity of the soils, it was found that the urease activity in the presence of toluene was largely associated with the clay-organic matter complex whereas in the absence of toluene it was associated with the organic matter of the soils.