Interference of Brassicaceae and Poaceae on Canola Hybrids

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.

Competitive ability of canola (Brassica napus var. oleifera) hybrids with black oat (Avena strigosa) in a subtropical environment

“…In competitive studies with ryegrass (Lolium multiflorum), which is also a Poaceae, the behavior between canola varieties determined the survival strategy generated by the competition (34); for example, the hybrid Hyola 571 invests in taller plants, allowing greater capture of solar radiation (22). In this study, the difference in architecture between species showed greater differentials, where the canola was more efficient in capturing light when compared to some Poaceae species (33,36).…”

“…The mass accumulation of canola was consistent with the final grain production (20); thus, any weed species interference will result in loss of yield. With the development of more competitive hybrids, it has been possible to use more aggressive species, obtaining a higher final grain yield in the presence of weeds compared to less competitive hybrids (33). In field conditions, the use of more competitive hybrids can decrease up to 50% of the accumulation of biomass in weeds (21).…”