Soil description

The sloping (2%) brown clay soil supported brigalow (Acacia harpophylla) and belah (Casuarina cristata) vegetation prior to clearing in 1963. Salts are concentrated at 40-50 cm, and 80% of potential plant available water (100 mm) is held in the surface 60 cm.
In its virgin state, the soil is most closely related to a Red Brown Earth derived from Glauconitic lithic sandstone

Once cultivated the mixing of the original surface results in the soil being described a brown clay Ug 5.32 (Northcote,1979). The surface varies from weakly self-mulching to moderately crusted to weakly hardsetting depending on environmental conditions including recent rainfall and cover, and exhibits cracking and self-mulching characteristics when dry. The soil has a plant water capacity of 150 mm in the top 1.5 m of soil.

Climate

Description of climate

Rainfall summary

Methodology

Treatments and operations

Operations summary

Soil water

Soil water calculations (Gravimetric, volumetric and PAW)

Sample result

Rainfall, runoff and suspended sediment for conventional tillage, Wallumbilla 1984-1996