Effect of combined soil water and external load on soil compaction
M. A. Hamza A C , S. S. Al-Adawi B and K. A. Al-Hinai B
+ Author Affiliations
- Author Affiliations
A Department of Agriculture and Food, Western Australia, 444 Albany Highway, Albany, WA 6330, Australia.
B Department of Soils, Water and Agricultural Engineering, PO Box 34, AlKhoud, Sultan Qaboos University, Muscat, Oman.
C Corresponding author. Email: mhamza@agric.wa.gov.au
Soil Research 49(2) 135-142 https://doi.org/10.1071/SR09144
Submitted: 12 August 2009 Accepted: 15 September 2010 Published: 10 March 2011
Abstract
Reducing soil compaction is now an important issue in agriculture due to intensive use of farm machinery in different farm operations. This experiment was designed to study the influence of combinations of external load and soil water on soil compaction. Four soil water levels were combined with four external loads as follows: soil water—air-dry, 50% of field capacity, field capacity, and saturation; external load using different-sized tractors—no load (0 kg), small tractor (2638 kg), medium tractor (3912 kg), and large tractor (6964 kg). Soil bulk density, soil strength, and soil water infiltration rate were measured at 0–100, 100–200, and 200–300 mm soil depths. The 16 treatments were set up in a randomised block design with three replications.
Combined increases in soil water and external load increased soil compaction, as indicated by increasing soil bulk density and soil strength and decreasing soil water infiltration rate. There was no significant interaction between soil water and external load for bulk density at all soil depths, but the interaction was significant for soil strength and infiltration rates at all soil depths. The ratio between the weight of the external load and the surface area of contact between the external load and the ground was important in determining the degree of surface soil compaction. Least compaction was produced by the medium tractor because it had the highest tyre/ground surface area contact. In general, the effects of soil water and external load on increasing soil bulk density and soil strength were greater in the topsoil than the subsoil.
Additional keywords: external load, soil compaction, soil strength, soil bulk density.
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