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Please use this identifier to cite or link to this item: http://www.lsln.net.au/jspui/handle/1/14134
Type: journalArticle
Title: Impacts of periodic tillage on soil C stocks: a synthesis
Authors: Conant, R.T.
Easter, M.
Paustian, K.
Swan, A.
Williams, S.
Year: 2007
Citation: Volume: 95
Issue: 1-2
Abstract: Long-term loss of soil C stocks under conventional tillage and accrual of soil C following adoption of no-tillage have been well documented. No-tillage use is spreading, but it is common to occasionally till within a no-till regime or to regularly alternate between till and no-till practices within a rotation of different crops. Short-term studies indicate that substantial amounts of C can be lost from the soil immediately following a tillage event, but there are few field studies that have investigated the impact of infrequent tillage on soil C stocks. How much of the C sequestered under no-tillage is likely to be lost if the soil is tilled? What are the longer-tenn impacts of continued infrequent no-tillage? If producers are to be compensated for sequestering C in soil following adoption of conservation tillage practices, the impacts of infrequent tillage need to be quantified. A few studies have examined the short-term impacts of tillage on soil C and several have investigated the impacts of adoption of continuous no-tillage. We present: (1) results from a modeling study carried out to address these questions more broadly than the published literature allows, (2) a review of the literature examining the short-term impacts of tillage on soil C, (3) a review of published studies on the physical impacts of tillage and (4) a synthesis of these components to assess how infrequent tillage impacts soil C stocks and how changes in tillage frequency could impact soil C stocks and C sequestration. Results indicate that soil C declines significantly following even one tillage event (1-11 % of soil C lost). Longer-term losses increase as frequency of tillage increases. Model analyses indicate that cultivating and ripping are less disruptive than moldboard plowing, and soil C for those treatments average just 6% less than continuous NT compared to 27% less for CT. Most (80%) of the soil C gains of NT can be realized with NT coupled with biannual cultivating or ripping. (C) 2007 Elsevier B.V. All rights reserved.
Zotero ID: 755XZJRX
URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TC6-4N0GDMW-2&_user=9005648&_coverDate=09%2F30%2F2007&_rdoc=1&_fmt=high&_orig=gateway&_origin=gateway&_sort=d&_docanchor=&view=c&_searchStrId=1752795973&_rerunOrigin=scholar.google&_acct=C000050221&_version=1&_urlVersion=0&_userid=9005648&md5=143aaa3d933b08591f146ac07e114869&searchtype=a
URL: http://www.lsln.net.au/jspui/handle/1/14134
ISSN: 0167-1987
DOI: 10.1016/j.still.2006.12.006
Journal Title: Soil Tillage Research
Geo Location: none
Appears in Collections:North Coast Local Land Services

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