In this 2013 trial:
- Hyola 404RR was the highest yielding canola variety and produced highest gross margins.
- Open pollinated varieties GT Viper and ATR Stingray had higher economic optimum plant density than hybrid varieties Hyola 404RR and Hyola 450TT.
- Roundup Ready canola provided better weed control than Triazine Tolerant.
The canola industry in Western Australia is expanding. Primarily, growers choose open pollinated Triazine Tolerant (TT) varieties. However breeding companies are favouring the development of hybrids in order to pay for breeding services. Hybrids provide growers with more vigorous seedlings, comparatively better plant establishment and generally higher yields. However growers have to purchase new seed of hybrid varieties every year in order to get these potential yield benefits. Seed for hybrid canola is approximately 25 times more expensive than the seed of open-pollinated canola. Inevitably if growers use hybrids they may wish to minimise seed costs by sowing at low densities.
To investigate the plant density response to yield and oil content of Triazine Tolerant (TT) and Roundup Ready (RR) hybrid canola in comparison with open-pollinated canola.