Author:
Cotching W. E.,Cooper J.,Sparrow L. A.,McCorkell B. E.,Rowley W.
Abstract
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.
tenosols, sandy soils, organic carbon, soil strength, aggregate stability,
land management, cropping.
Subject
Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)
Cited by
10 articles.
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