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Fungicide seed coating decreased rhizobia survival and nodulation of field pea

Authors: Judith Rathjen1, Maarten Ryder1, Thang Viet Lai1, Matthew Denton1

1University of Adelaide, Waite Campus, Urrbrae

Funded by: GRDC project 9176500. Increasing the effectiveness of nitrogen fixation in pulse crops through development of improved rhizobial strains, inoculation and crop management practices.

Peer review:

Key Words: field pea, rhizobia, nodulation, nodules, n fixation, fungicide seed coating

Key Messages

  • Nodulation was reduced when pea seeds were coated with P-Pickel T fungicide before inoculation
  • Reductions in rhizobia numbers on fungicide-coated seeds occurred very quickly, within 2 h, but the toxic effect of the fungicide continued after sowing
  • Dry soil conditions at sowing in 2018 are likely to have exacerbated fungicide toxicity to the rhizobia
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Effect of rate and placement of phosphorus on vetch performance Herbicide Residues from Summer Spraying: Are they an issue?
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