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Effects of agricultural management on Tenosols in northern Tasmania


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Cotching, WE, Cooper, J, Sparrow, LA, McCorkell, BE and Rowley, W 2002 , 'Effects of agricultural management on Tenosols in northern Tasmania' , Australian Journal of Soil Research, vol. 40, no. 1 , pp. 45-63 , doi: 10.1071/SR01005.

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Attributes of 15 Tasmanian sandy tenosols were assessed using field and laboratory techniques to
determine differences under 3 typical forms of agricultural management: long-term pasture, cropping with
shallow tillage using discs and tines, and cropping (including potatoes) with more rigorous and deeper
tillage including deep ripping and powered implements. Soil organic carbon in the surface 75 mm was 2.6%
under long-term pasture compared with 1.1% in rigorously tilled cropping paddocks. Readily oxidisable
carbon concentrations were 2.3 mg/g and 1.0 mg/g, respectively. These differences were negatively
correlated with the number of years cropped, which we viewed with concern. Infiltration rate was greater
and shear strength less in cropped paddocks compared with long-term pasture. Dry bulk density was greater
and total porosity and macroporosity were less in rigorously tilled paddocks. Subsoil compaction was
apparent in paddocks which had grown potatoes. Cropping was not clearly associated with smaller or less
stable aggregates. A survey of farmers’ perceptions found that they identified more healthy than unhealthy
soil attributes under all management histories. Significant negative correlations were found between the
number of unhealthy attributes identified in a farmer survey and laboratory-determined water-stable
aggregates and mean weight diameter of dry soil aggregates. The effects of cropping are not associated with
a broad range of degraded soil attributes on these Tasmanian tenosols.

Item Type: Article
Authors/Creators:Cotching, WE and Cooper, J and Sparrow, LA and McCorkell, BE and Rowley, W
Keywords: tenosols, sandy soils, organic carbon, soil strength, aggregate stability, land management, cropping
Journal or Publication Title: Australian Journal of Soil Research
ISSN: 0004-9573
DOI / ID Number: 10.1071/SR01005
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