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Persistent improvements in the structure and hydraulic conductivity of a Ferrosol due to liming

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posted on 2023-05-16, 18:11 authored by Kirkham, JM, Barry RoweBarry Rowe, Richard DoyleRichard Doyle
Changes in the soil structure and hydraulic conductivity of an Acidic Red Ferrosol were measured in a long-term (1968-2003) fertiliser experiment on pasture in north-western Tasmania, Australia. Studies were initiated following observations of both softer soil surface and cracking on plots that had received 15 t/ha of ground agricultural limestone. Liming decreased penetration resistance and increased hydraulic conductivity. These structural improvements were associated with increased mean dry aggregate size, a small increase in wet aggregate stability, higher exchangeable calcium levels, and increased plant growth, but a 9% decrease in total soil organic carbon in the surface 50 mm. This decrease in organic carbon was not associated with deterioration in soil structure, as may have been anticipated. This was probably because total organic C was still 82 g/kg on unlimed plots. Decreases in soil penetration resistance due to liming increased the likelihood of pugging from livestock but may improve ease of tillage. This research demonstrates that liming can improve the structure of a well-aggregated Ferrosol as well as its previously reported effects of increasing soil pH and yields of pasture and barley despite decreasing organic C. © CSIRO 2007.

Funding

Horticulture Innovation Australia

History

Publication title

Australian Journal of Soil Research

Volume

45

Pagination

218-233

ISSN

0004-9573

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

CSIRO

Place of publication

Australia

Repository Status

  • Restricted

Socio-economic Objectives

Sown pastures (excl. lucerne)

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