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<title>UTas ePrints - Crop yields and soil properties on eroded slopes of red ferrosols in north-west Tasmania</title>
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<meta content="Cotching, William Edward" name="eprints.creators_name" />
<meta content="Hawkins, K." name="eprints.creators_name" />
<meta content="Sparrow, L.A." name="eprints.creators_name" />
<meta content="McCorkell, B.E." name="eprints.creators_name" />
<meta content="Rowley, W." name="eprints.creators_name" />
<meta content="Bill.Cotching@utas.edu.au" name="eprints.creators_id" />
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<meta content="ferrosols, erosion, soil redistribution, organic carbon, crop yield" name="eprints.keywords" />
<meta content="The differences in soil properties and crop yield on slopes of varying steepness in intensively cropped paddocks with red ferrosols (Humic Eutrodox), which had evidence of erosion over many years, were determined at 5 sites in north-west Tasmania. We found that soils on the steeper slopes, which have had greater soil loss, had significantly lower topsoil carbon concentrations than soils on flatter slopes. We found that significant redistribution of soil had occurred on the sites in this study. Areas with concave slope positions had over-thickened topsoils. However, the effect of erosion on the topsoil thickness of eroded slope positions was masked by the uniform depth of cultivation across paddocks. Penetration resistance increased gradually with depth on all transects, indicating no compacted layers or plough pans on these intensively cropped sites. Soil physical properties did not significantly change from non-eroded, level areas to steep, eroded parts of the paddocks, even although considerable soil loss had occurred from the steep slopes. We attribute this to the gradational nature of these red ferrosols, which characteristically have strongly structured subsoils. Crop yield was significantly correlated with slope but was not significantly different on land up to 18% slope. We anticipate that continued erosion at current rates on this less steep land will inevitably reduce crop yields. We found a significant correlation between organic carbon, total exchangeable bases, extractable K, and crop yield, but no correlation between available water content and crop yield. We conclude that soil organic matter contributes to productivity through its effect on nutrient concentrations. Total exchangeable bases appeared to provide the best and simplest explanatory model to predict crop yield. We propose a set of 4 tests for future assessment of soil condition on these red ferrosols.
" name="eprints.abstract" />
<meta content="2002" name="eprints.date" />
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<meta content="Australian Journal of Soil Research" name="eprints.publication" />
<meta content="40" name="eprints.volume" />
<meta content="4" name="eprints.number" />
<meta content="625-642" name="eprints.pagerange" />
<meta content="10.1071/SR01062" name="eprints.id_number" />
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<meta content="Cotching, W.E. 1995, 'A review of the challenges for long term management of
krasnozems in Australia', Australian Journal of Soil and Water Conservation,
vol 8(1), pp.18-27.
Cotching, W.E., Hawkins, K., Sparrow, L.A., McCorkell, B.E. & Rowley W. 2003, (in
press). Crop yields and soil properties on eroded slopes of red ferrosols in
northwest Tasmania. Australian Journal of Soil Research 40(4).
Edwards, K. & Zierholz, C. 2000, 'Soil formation and erosion rates'. In Soils: Their Properties and Management Second Edition. P.E.V. Charman & B.W. Murphy (eds),. Oxford University Press: Melbourne, pp. 39-57.
Feller, M..C. 1981, 'Catchment nutrient budgets and geological weathering in Eucalyptus regnans ecosystems in Victoria', Australian Journal of Ecology, vol 6, pp. 65-77.
Isbell, R.F. 1996, The Australian Soil Classification, Australian Soil and Land Survey Series, Volume 4. CSIRO: Collingwood, Vic.
Moreton, R.M. & Grose C.J. 1997, Land Capability Survey of Tasmania. Forth Report, Department of Primary Industry and Fisheries: Tasmania, Australia.
Richley, L., Loughran, R.J., Elliott, G.L. & Saynor, M.J. 1997, A National Reconnaissance Survey of Soil Erosion Tasmania, A report prepared for the Australian National Landcare Program. University of Newcastle: Callaghan, NSW.
Sims, C.C. & Cotching, W.E. 2000, 'Erosion and Water Quality - Turbidity and Sediment
Loads from Selected Catchments in Tasmania’s North West', Natural Resource
Management Journal vol. 3,(1) pp.8-14.
Soil Survey Staff 1998 Keys to Soil Taxonomy’ 8th ed, Natural Resources Conservation Service, United States Department of Agriculture." name="eprints.referencetext" />
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<meta content="The differences in soil properties and crop yield on slopes of varying steepness in intensively cropped paddocks with red ferrosols (Humic Eutrodox), which had evidence of erosion over many years, were determined at 5 sites in north-west Tasmania. We found that soils on the steeper slopes, which have had greater soil loss, had significantly lower topsoil carbon concentrations than soils on flatter slopes. We found that significant redistribution of soil had occurred on the sites in this study. Areas with concave slope positions had over-thickened topsoils. However, the effect of erosion on the topsoil thickness of eroded slope positions was masked by the uniform depth of cultivation across paddocks. Penetration resistance increased gradually with depth on all transects, indicating no compacted layers or plough pans on these intensively cropped sites. Soil physical properties did not significantly change from non-eroded, level areas to steep, eroded parts of the paddocks, even although considerable soil loss had occurred from the steep slopes. We attribute this to the gradational nature of these red ferrosols, which characteristically have strongly structured subsoils. Crop yield was significantly correlated with slope but was not significantly different on land up to 18% slope. We anticipate that continued erosion at current rates on this less steep land will inevitably reduce crop yields. We found a significant correlation between organic carbon, total exchangeable bases, extractable K, and crop yield, but no correlation between available water content and crop yield. We conclude that soil organic matter contributes to productivity through its effect on nutrient concentrations. Total exchangeable bases appeared to provide the best and simplest explanatory model to predict crop yield. We propose a set of 4 tests for future assessment of soil condition on these red ferrosols.
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<h1 class="ep_tm_pagetitle">Crop yields and soil properties on eroded slopes of red ferrosols in north-west Tasmania</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Cotching, William Edward</span> and <span class="person_name">Hawkins, K.</span> and <span class="person_name">Sparrow, L.A.</span> and <span class="person_name">McCorkell, B.E.</span> and <span class="person_name">Rowley, W.</span> (2002) <xhtml:em>Crop yields and soil properties on eroded slopes of red ferrosols in north-west Tasmania.</xhtml:em> Australian Journal of Soil Research, 40 (4). pp. 625-642. ISSN 0004-9573</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_2636' );" href="http://eprints.utas.edu.au/2096/1/AJSR_full_text.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_2636' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_2636"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/2096/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/2096/1/AJSR_full_text.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />232Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1071/SR01062">http://dx.doi.org/10.1071/SR01062</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The differences in soil properties and crop yield on slopes of varying steepness in intensively cropped paddocks with red ferrosols (Humic Eutrodox), which had evidence of erosion over many years, were determined at 5 sites in north-west Tasmania. We found that soils on the steeper slopes, which have had greater soil loss, had significantly lower topsoil carbon concentrations than soils on flatter slopes. We found that significant redistribution of soil had occurred on the sites in this study. Areas with concave slope positions had over-thickened topsoils. However, the effect of erosion on the topsoil thickness of eroded slope positions was masked by the uniform depth of cultivation across paddocks. Penetration resistance increased gradually with depth on all transects, indicating no compacted layers or plough pans on these intensively cropped sites. Soil physical properties did not significantly change from non-eroded, level areas to steep, eroded parts of the paddocks, even although considerable soil loss had occurred from the steep slopes. We attribute this to the gradational nature of these red ferrosols, which characteristically have strongly structured subsoils. Crop yield was significantly correlated with slope but was not significantly different on land up to 18% slope. We anticipate that continued erosion at current rates on this less steep land will inevitably reduce crop yields. We found a significant correlation between organic carbon, total exchangeable bases, extractable K, and crop yield, but no correlation between available water content and crop yield. We conclude that soil organic matter contributes to productivity through its effect on nutrient concentrations. Total exchangeable bases appeared to provide the best and simplest explanatory model to predict crop yield. We propose a set of 4 tests for future assessment of soil condition on these red ferrosols.
</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">ferrosols, erosion, soil redistribution, organic carbon, crop yield</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/300100.html">300000 Agricultural, Veterinary and Environmental Sciences > 300100 Soil and Water Sciences</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2096</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr William Cotching</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">09 Oct 2007 10:13</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2096;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=2096">item control page</a></p>
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