In this 2013 trial:
- Canola yield responded to increasing plant density to 65 plants per square metre (plants/m²) but there was very little response at densities greater than 20 to 30 plants/m²
- The response was variable within this trial site, which means that is very likely to be quite variable across different years and locations.
- Roundup Ready (RR) canola enabled much better weed control than triazine tolerant canola on this site.
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 25 times more expensive than the seed of open pollinated canola. If growers decide to grow hybrids they may wish to minimise seed costs by sowing at lower densities.
To compare the plant density response of yield and oil content between hybrid and open pollinated (OP) canola in Triazine Tolerant (TT) and RR herbicide tolerance groups.