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    The potential of culinary vegetable oils as herbicides in organic farming: The effect of oil type and repeated applications on plant growth

    Hodge, Simon; Merfield, Charles; Bluon, A.; Berry, Nadine Angela; OConnell, Dean
    Abstract
    This study tested the herbicidal effects of raw and processed culinary oils (rapeseed oil, sunflower oil, olive oil, flax/linseed oils) on nine plant species (poppy, white clover, alyssum, lupin, buckwheat, mustard, oats, perennial ryegrass, tall fescue). Oils were also tested on weeds that naturally emerged from farm soil. Plants were coated with oil using a pressurized hand pump, then maintained in a glasshouse or outdoor plant facility until harvested approximately 5 weeks after oil application. All the oils tested caused a decrease in plant dry matter compared with water-sprayed control treatments, although there was some inconsistency in herbicidal effects among plant species, trials and growing conditions. Spraying plants with rapeseed oil on multiple occasions tended not to be more phytotoxic than only a single spraying. Raw or organic oils were not consistently more phytotoxic than processed versions of the same oil type. There was some evidence that negative effects of oils on plant growth were more apparent under warmer conditions. The results suggest that culinary oils could reduce the biomass of weeds in an environmentally friendly way that is permissible to organic growers. However, the herbicidal activity of these oils appears low, and the quantities required to obtain substantial weed control may not be economically viable in all instances.... [Show full abstract]
    Keywords
    cooking oil; olive oil; rapeseed oil; sunflower oil; linseed oil; flax oil; organic farming
    Fields of Research
    0701 Agriculture, Land and Farm Management; 070108 Sustainable Agricultural Development; 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
    Date
    2018-03-10
    Type
    Journal Article
    Collections
    • Department of Agricultural Sciences [1422]
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    HodgeMerfieldBluonBerryO'Connell+oils+as+herbicides+2019-am.pdf
    DOI
    https://doi.org/10.1007/s13165-018-0208-z
    Metadata
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    © Springer Science+Business Media B.V., part of Springer Nature 2018
    Citation
    Hodge, S., Merfield, C.N., Bluon, A., Berry, N.A, & O'Connell, D.M. (2018). The potential of culinary vegetable oils as herbicides in organic farming: The effect of oil type and repeated applications on plant growth. Organic Agriculture. doi:10.1007/s13165-018-0208-z
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