For growers who want to keep things simple, a standard seeding rate of 5 lb./ac. should meet the basic needs of stand establishment — as long as all other steps for a good stand are followed.
Growers who want a seeding rate that establishes 7 to 10 plants per square foot — 5 plants is about the minimum but you should add a few extra plants for a safety cushion — will want to adjust the seeding rate based on seeding date (cool soils may require a higher seeding rate given the likelihood of higher seeding mortality) and thousand seed weight. Read how to do that.
If growers have budgeted on a fixed seeding rate in lb./ac., consider seeding heavier in cold soils, trashy conditions or other poor seedbed fields and using lower seeding rates on fields with excellent emergence expectations.
Source: Alberta Canola Producers Commission