Canola plant populations (in farm field surveys completed during provincial weed surveys around the time of this analysis) were below the economically optimal canola densities of 62–73 plants/m2, considering average prices at the time of the analysis, seed size, and emergence rates.
Canola is a significant crop in Canada, so when canola seed prices increased, many growers reduced their seeding rates and therefore produced lower plant densities. This increased interest in target plant densities for canola and reassessment of industry recommendations for economic optimal densities and seeding rates.
The objective of this meta-analysis was to evaluate the relationship between plant density and yield response of herbicide resistant hybrid canola grown in western Canada in multiples studies, as well as to determine optimal densities which are most economical for growers.
Farm field surveys completed during provincial weed surveys around the time of this analysis showed that plant populations were below the economically optimal canola densities of 62–73 plants m−2 considering average prices at the time of the analysis, seed size, and emergence rates. The results also emphasize the importance of an economical canola plant density as well as the need for tools to help growers make these canola seeding decisions.
For details, see the ‘Estimating the economic optimal target density of hybrid canola based on data from a western Canadian meta-analysis’ paper published on this research.