Organic carbon and total nitrogen stocks in a Vertisol following 40 years of no-tillage, crop residue retention and nitrogen fertilisation

Dalal, R. C., Allen, D. E., Wang, W. J., Reeves, S. and Gibson, I. (2011) Organic carbon and total nitrogen stocks in a Vertisol following 40 years of no-tillage, crop residue retention and nitrogen fertilisation. Soil and Tillage Research, 112 2: 133-139. doi:10.1016/j.still.2010.12.006


Author Dalal, R. C.
Allen, D. E.
Wang, W. J.
Reeves, S.
Gibson, I.
Title Organic carbon and total nitrogen stocks in a Vertisol following 40 years of no-tillage, crop residue retention and nitrogen fertilisation
Journal name Soil and Tillage Research   Check publisher's open access policy
ISSN 0167-1987
Publication date 2011-04
Sub-type Article (original research)
DOI 10.1016/j.still.2010.12.006
Open Access Status
Volume 112
Issue 2
Start page 133
End page 139
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Conservation agricultural practices such as no-till (NT) and crop residue retention (CRR), and nutrient application, increases soil organic C (SOC) and are considered effective measures of C sequestration in soil. However, long-term effects of individual components of conservation agriculture and their interactions on SOC are rarely evaluated; as a result, conflicting findings of these practices on SOC are reported in the literature. We measured SOC and soil total N in a balanced factorial experiment, conducted on a Vertisol, consisting of tillage practices (conventional mechanical tillage, CT; and no-tillage, NT), crop residue management (crop residue burned, CRB; and crop residue retained, CRR) and N fertiliser application (no N, 30 kg N ha−1 year−1; and 90 kg N ha−1 year−1). The site, in a semiarid subtropical region, was cropped with wheat (Triticum aestivum L.) except for 3 years of barley (Hordeum vulgare L.), for 40 years using conservation practices.

In general, tillage effects on SOC and soil total N were small. Crop residue and N fertiliser interactively increased SOC and total N stocks at 0–0.1 m depth and cumulative stocks at 0–0.2 m and 0–0.3 m depths; that is, CRR increased SOC and soil total N only when N fertiliser was applied, and fertilisation increased SOC and soil total N only under CRR treatment. Depletion of δ13C values in CRR treatments and δ15N values in N treatments strongly indicated the contribution of crop residue (and root biomass) and N fertiliser to soil organic matter in this Vertisol. From this study and previous findings from this site, it appears, however, the effects of crop residue retention and N fertiliser occurred in early years, and did not continually increase SOC and total soil N with increasing period of conservation practices.
Keyword Carbon
Nitrogen
Soil organic matter
No-till
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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