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Title: Soil organic carbon and microbial biomass carbon under organic and conventional vegetable cropping systems in an Alfisol and a Vertisol
Contributor(s): Bajgai, Yadunath (author); Kristiansen, Paul  (author)orcid ; Hulugalle, Nilantha (author); McHenry, Melinda (author); McCorkell, Bruce (author)
Publication Date: 2015
DOI: 10.1007/s10705-014-9656-3
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Abstract: Despite scant crop residue input, tillage to control weeds in vegetable systems reduces soil organic carbon (SOC) levels. We hypothesized that vegetable production systems could be made more resistant to the negative effects of tillage on SOC by including a high-residue crop in rotation. Effect of sweet corn ('Zea mays L. var. rugosa') residue incorporation in a corn-cabbage ('Brassica oleracea' L.) rotation in two soil management systems (SMS) (organic or conventional) in two soil types [a Chromosol (Alfisol) and a Vertosol (Vertisol)] on SOC and microbial biomassC(MBC) levels was tested for 2 years. Confounded factors (weed management and fertilisers) in the field experiment were separated in a multi-factorial laboratory experiment. In the field, total organic C (TOC) concentration was increased by 6.5 % in the 0-0.1 m depth by incorporating residue; however SMS exhibited inconsistent results. Organic fertilisers increased TOC whilst simulated tillage decreased it in laboratory. Soil MBC data showed that the biological fertility of soil can be improved by incorporating residues or by combining residue with organic fertiliser. In field residue incorporation in soil increased TOC, but organic fertilisers behaved inconsistently. However, in a laboratory microcosm, both residue and organic fertilisers individually mitigated tillage-induced loss of TOC.
Publication Type: Journal Article
Source of Publication: Nutrient Cycling in Agroecosystems, 101(1), p. 1-15
Publisher: Springer Netherlands
Place of Publication: The Netherlands
ISSN: 1385-1314
Field of Research (FOR): 070108 Sustainable Agricultural Development
050301 Carbon Sequestration Science
Socio-Economic Outcome Codes: 829899 Environmentally Sustainable Plant Production not elsewhere classified
961402 Farmland, Arable Cropland and Permanent Cropland Soils
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
School of Environmental and Rural Science

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