Interpreting results for plant growth promotion and disease suppression bioassays using compost

Paper

Pittaway, P.. 2014. "Interpreting results for plant growth promotion and disease suppression bioassays using compost." Biala, J., Prange, R. and Raviv, M. (ed.) 1st International Symposium Organic Matter Management and Compost in Horticulture (ISHS 2011). Adelaide, Australia 04 - 07 Apr 2011 Leuven, Belgium.
Paper/Presentation Title

Interpreting results for plant growth promotion and disease suppression bioassays using compost

Presentation TypePaper
Authors
AuthorPittaway, P.
EditorsBiala, J., Prange, R. and Raviv, M.
Journal or Proceedings TitleActa Horticulturae
Journal Citation1018, pp. 181-186
Number of Pages6
Year2014
Place of PublicationLeuven, Belgium
ISSN0567-7572
ISBN9789462610040
Web Address (URL) of Paperhttp://www.ishs.org/ishs-article/1018_17
Conference/Event1st International Symposium Organic Matter Management and Compost in Horticulture (ISHS 2011)
Event Details
1st International Symposium Organic Matter Management and Compost in Horticulture (ISHS 2011)
Event Date
04 to end of 07 Apr 2011
Event Location
Adelaide, Australia
Abstract

Applying high rates of humified, thermophilic compost and vermicompost to a soil depleted in organic carbon has the potential to improve soil structure and soil fertility, and also to suppress soilborne disease. In this paper, published bioassay methods were used to assess the disease-suppressing properties of cured, thermophilic cotton trash Applying high rates of thermophilic compost and vermicompost to a soil depleted in organic carbon has the potential to improve soil structure and fertility, and to suppress soilborne disease. Published bioassay methods were used to assess the disease-suppressing properties of three cured cotton trash composts, and the plant growth promoting properties of filtrate produced from pig manure vermicompost. The chemical properties of the composts and the Fusarium wilt infested receiving soil were analysed, to assess other soil health parameters likely to affect plant growth.
Results were not as expected. Cotton seedling survival in the compost treatments was only marginally better than the control, with all seedlings showing disease symptoms. In the plant growth promotion assay, seed germination was highest in the water-only controls, with the vermi- and mesophilic (no worm) compost filtrates inhibiting root growth. The common factor responsible for the unexpected results was excessive salinity. To realize the soil health benefits of organic amendments, application rates must account for the concentration of plantavailable nutrients and soluble salts that they contain.

KeywordsFusarium wilt; compost worms; soil health; organic amendments; soluble salts
ANZSRC Field of Research 2020410603. Soil biology
300409. Crop and pasture protection (incl. pests, diseases and weeds)
410601. Land capability and soil productivity
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Byline AffiliationsNational Centre for Engineering in Agriculture
Institution of OriginUniversity of Southern Queensland
Book TitleActa horticulturae 1018
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