Variability of acidity in agricultural soils—the impact of timber burning at land clearing
Mark A. Fraser A C and Brendan J. Scott B
+ Author Affiliations
- Author Affiliations
A Farming Horizons P/L, 116 High Street, Howlong, NSW 2643, Australia.
B School of Agricultural and Veterinary Sciences, Charles Sturt University, PO Box 588, Wagga Wagga, NSW 2678, Australia.
C Corresponding author. Email: farminghorizons@southernphone.com.au
Soil Research 49(3) 223-230 https://doi.org/10.1071/SR10076
Submitted: 31 March 2010 Accepted: 8 October 2010 Published: 12 April 2011
Abstract
Patchiness in the growth of barrel medic, Medicago truncatula, in the central west of New South Wales, near Condobolin, has been associated with variability of soil acidity. There is evidence of the effect of timber burning on soil properties and it is possible that such burning of timber stacks and windrows on land recently cleared for agriculture may add alkali and contribute to such pasture growth. Of the three sites used, two were already in a 20-year farming system and one was constructed in a recently cleared paddock. Soil sampled at the 0–0.10, 0.10–0.20, and 0.20–0.30 m soil depths indicated significant increases in soil pHCa and extractable Ca to a soil depth of at least 0.20 m for up to 20 years after timber had been burnt. The effect of the timber burn on soil chemistry was due to the conversion of alkali oxides to either hydroxides or carbonates. This addition of alkali moved relatively rapidly through the soil profile in a low-rainfall farming system. Additional alkali was found in the soil, mainly at the 0–0.10 m depth, in the form of free lime. Using assumed rates of soil acidification, the burn effect could persist for up to 1227 years before reverting to the pre-burn soil pH. It was also found that timber burning at the sites contributed to the spatial variability of soil acidity.
Additional keywords: free lime, longevity of burn effect, low rainfall farming systems, soil acidity, spatial variability.
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