Three long-term trials end with a quasi-equilibrium between soil C, N, and pH: an implication for C sequestration
Article
Article Title | Three long-term trials end with a quasi-equilibrium between soil C, N, and pH: an implication for C sequestration |
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ERA Journal ID | 5248 |
Article Category | Article |
Authors | Conyers, Mark (Author), Newton, Philip (Author), Condon, Jason (Author), Poile, Graeme (Author), Mele, Pauline (Author) and Ash, Gavin (Author) |
Journal Title | Soil Research |
Journal Citation | 50 (7), pp. 527-535 |
Number of Pages | 9 |
Year | 2012 |
Publisher | CSIRO Publishing |
Place of Publication | Australia |
ISSN | 0004-9573 |
1446-568X | |
1838-675X | |
1838-6768 | |
Digital Object Identifier (DOI) | https://doi.org/10.1071/SR12185 |
Web Address (URL) | https://www.publish.csiro.au/sr/SR12185 |
Abstract | The aim of this study was to assess the long-term changes in some key soil chemical properties at the completion of three long-term trials in south-eastern Australia and the relationship between those soil properties. From a soil organic matter perspective, the build-up of carbon (%C) requires an accumulation of nitrogen (%N), and the build-up of %C and %N fertility comes at the cost of soil acidity. Rotation, tillage, and stubble practices combine to alter the quantity, quality (C:N), and the depth distribution of organic matter in a soil, but the three soil chemical properties reported here seem to also be in quasi-equilibrium at the three long-term sites. The consequence is that if the build-up of soil organic matter leads to soil acidification, then the maintenance of agricultural production will require liming. The emission of CO2 when limestone reacts with soil acids, plus the C cost of limestone application, will negate a proportion of the gains from C sequestration as organic matter in soil. Such cautionary information was doubtless unforeseen when these three long-term trials were initiated. |
Keywords | organic matter; soil acidification |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Charles Sturt University |
Department of Primary Industries, Victoria | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q42xz/three-long-term-trials-end-with-a-quasi-equilibrium-between-soil-c-n-and-ph-an-implication-for-c-sequestration
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