Influence of nutrient availability on changes in stable soil organic matter levels following crop stubble retention

Clive Kirkby

Research output: ThesisDoctoral Thesis

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Abstract

The objective of this research was to investigate ways to increase the amount of C transferred to the stable SOM (humus) pool following crop residue retention. The central hypothesis was that humus has a constant stoichiometry of CNPS reflecting its largely microbial origin, and that sequestration of C-rich crop residue material into the humus pool could be improved by adding supplementary nutrients to the residues to achieve these ratios. A review of the literature and measurement of 59 Australian soils confirmed that soil humus had a near constant C:N:P:S ratio. A series of microcosm experiments were then conducted using wheat straw incubated with or without supplementary nutrients (N, P and S) to investigate the impact on C sequestration into the humus pool.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Charles Sturt University
Supervisors/Advisors
  • Kirkegaard, John, Co-Supervisor
  • Richardson, Alan E., Co-Supervisor, External person
  • Wade, Leonard, Co-Supervisor
  • Batten, Graeme, Co-Supervisor
  • Blanchard, Christopher, Co-Supervisor
Award date01 Dec 2011
Place of PublicationAustralia
Publisher
Publication statusPublished - 2011

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