Abstract
ABSTRACT: The objective of this study was to evaluate the initial competitive ability of canola hybrids against Brassicaceae and Poaceae species in terms of root and shoot resources. Two experiments were conducted in greenhouse, in a completely randomized design with four replications. The treatments consisted of interference conditions by root + shoot interference (root+shoot) and shoot interference (Light); and Brassicaceae and Poaceae weeds competing with hybrid of canola (Hyola 61 and Diamond) with different traits for competitiveness. The plant height, root length, dry matter of shoot and root, number of leaves and leaf area were evaluated. Data were compared using orthogonal contrasts. The turnip and volunteer canola reduced root development of the Hyola 61 in root + shoot interference, and among the Brassicaceas weeds, turnip caused greater losses. Brassicaceas weeds caused largest reductions in Diamond’s hybrid growth compared to Poaceae, mainly under light interference. Brassicaceas and Poaceae weeds cause similar damage to Hyola 61 hybrid, and the injury is higher for root +shoot interference. The black oat induce shoot growth in the Diamond hybrid under shoot interference, while among the Brassicaceae weed species, there were no differences.
Highlights
Canola (Brassica napus L.) is a member of the Brassicaceae family and a potential alternative to winter wheat in the southern regions of Brazil
The main winter season weeds are turnip (Raphanus spp.), oat (Avena spp.), and ryegrass (Lolium multiflorum). Another problem is the occurrence of volunteer canola, which can be established in the seed bank due to high seed loss before and during harvesting (Huang et al, 2016)
Crop-weed interactions are influenced by the establishment time, plant diversity, inherent competitive ability of the species involved, allelopathy, and temporal and spatial resource availability
Summary
Canola (Brassica napus L.) is a member of the Brassicaceae family and a potential alternative to winter wheat in the southern regions of Brazil. The main winter season weeds are turnip (Raphanus spp.), oat (Avena spp.), and ryegrass (Lolium multiflorum). Another problem is the occurrence of volunteer canola, which can be established in the seed bank due to high seed loss before and during harvesting (Huang et al, 2016). Canola hybrids with characteristics of high competitive ability, such as rapid early growth and increased height, early flowering, high leaf area, high levels of allelopathy, and rapid establishment of the root system (Lemerle et al, 2014), can be used to reduce weed interference and to lower herbicide dependence, thereby minimizing weed problems in the long term (Williams et al, 2008)
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