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Can soil organic matter be increased in a continuous cropping system in the low to medium rainfall zone?

Authors: Harm van Rees1 and Michael Moodie2

Research Team: Jeff Baldock3

1Cropfacts P/L, 2Mallee Sustainable Farming, 3CSIRO

Funded By: GRDC CRF00002

Project Title: Improved management of soil organic matter and sustainable cropping

Peer Review: Jeff Baldock (CSIRO)

Key Words: organic matter, continuous cropping

Key Messages

  • 8 trial sites were established across SE Australia to investigate whether soil carbon levels can be increased in No-Till farming practices by adding nutrients to aid the biological breakdown of stubble and stabilise carbon in soil organic matter.
  • After 3 and 5 years of treatments no increase in soil carbon could be determined in any of the trials.
  • We demonstrated that soil carbon is unlikely to increase with current farming practices, however No-Till and stubble retention protects the soil from wind and water erosion which is a major pathway for loss of organic carbon. Over the longer time-frame, stubble retention systems may be able to slow the rate of carbon loss.
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Burning temperatures of harvest windrows and standing stubbles in low rainfall... Crop Sequencing Considerations for the Mallee
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