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    Impacts of Smooth Pigweed (Amaranthus hybridus) on Cover Crops in Southern Ontario

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    Author
    VanVolkenburg, Heather
    Guinel, Frederique C.
    Vasseur, Liette
    Keyword
    Cover crops
    Germination
    Plant growth
    Competition
    Facilitation
    Agriculture
    Allelopthy
    
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    URI
    http://hdl.handle.net/10464/14792
    Abstract
    Amaranthushybridus is anoxious weed in Ontario, with demonstrated allelopathic properties that can lead to decreased agricultural production. We tested the germination and growth of five cover crop species exposed to A. hybridus extracts, and to dried or fresh materials in soil. A germination index was calculated, and the dry weight of plant organs were measured to quantify responses to treatments. All species had reduced germination (≤29%) in 100% extract. Trifolium pratense had significant root weight reductions in extract (52%) and dried (72%) treatments, whereas shoot weight only decreased (48%) in dried treatment. Medicagosativa shoot weight decreased (52%) in 20g fresh treatment, while root weight decreased (62%) in dried treatment. Shoot weight of Raphanus sativus increased (32%) at mid-extract concentrations, while root weight increased (33%) only with dried treatment; however, both its shoot and root weight decreased (>40%) in fresh treatment. Only the shoot weight of Loliummultiflorum increased (41% in 75% extract and 55% in dried treatment). Both Cichorium intybus shoot and root weights decreased (~50%) in fresh treatment. Crop responses to A. hybridus are complex, and material and species-dependant. Further testing in the field may provide a more comprehensive understanding of how to improve the management of A. hybridus.
    ae974a485f413a2113503eed53cd6c53
    https://doi.org/10.3390/agronomy10040529
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