Author(s): Margaret G Myers, J W McGarity
The urease activity of soil profiles under swards of improved pasture, from five great soil groups from northern New South Wales, was determined by the modified Hoffmann-Teicher method. Arbitrary sampling depths generally coincided with well differentiated horizon boundaries and comparisons on a depth basis were made among the different soil groups. In all profiles urease activity was higher in the surface soil than in deeper horizons; except in the krasnozem the fall below the surface three inches was sharp. The urease activity below 18 inches in the chocolate soil was higher than in the podzolic and red-brown earth groups. In six samples from podzolic soils containing weathering parent material or gley mottles, no urease activity was detected.