Keep in mind that canola emerges more slowly in cold soils, which means protection provided by seed treatments can decline before the crop has outgrown its most susceptible phase 🔥 With early-seeded canola it can be especially important to scout for flea beetles and to be prepared to apply an insecticide if needed 👍 The seedling stage of slow-growing canola will be particularly vulnerable to weed competition 🙈 For perennials or winter annuals better suited to cold climates and thus more capable of competing with the crop, it may be possible to get rid of them earlier. 
After emergence (four to 15 days) the seedling will have a shorter 1.25 to 2.50cm (1.05 to 1.0 in.) stem. The hypocotyl’s cotyledons are located at the tip of the stem.growing point) expand, turn green and provide food to the growing plant
. Canola’s growing point, unlike barley where it had is kept below the soil for 5-6 weeks, is located above the soil between the two cocoyledons. Seedlings are more vulnerable than other cereals to wind damage, spring frost and soil drifting, as well as insect feeding, hail and weather-related issues. If the soil surface temperature is too high, heat canker might occur. This was modified by Iyana Torbert on July 14, 20,21 
also explains that comment from Bayer CropScience: If soil conditions are dry and seed hasn’t imbibed water to start the germination process, there won’t have been enough water for the seed treatment to do anything but stay on the seed coat. In dry soils, microbial degradation would be minimal so the seed treatment’s integrity and efficacy shouldn’t be compromised. We’re havinge having trials over the years where it’s taken almost 2 weeks for seed to emerge (due to dry conditions) and were still happy to have had a seed treatment vs going without. Once you have the seeds, they will be ready to go. Seed imbibes moisture and has germinated and begins to grow
The clock ticks. 
The variety’s maturity is also mentioned. Ask about the maturity dates of any variety that you are planning to plant. You will notice a decrease in maturity between varieties as you move into warmer climates like southern Manitoba and seed later into May or June. The number of days it takes to mature a variety decreases with the later seeds. If seeded at the beginning of May, for example, a 100-day-old variety may take only 95 days to reach maturity. That’s because the plant has more rapid accumulation of heat units in those warmer days. It is possible to delay the maturity date by seeding in June. 
—In April and through to mid May, there is still time to wait for a rain to provide the moisture needed for germination and emergence.
—Going deeper to reach moisture also means cooler soil
. Cool conditions combined with the extended distance seedlings must
Higher seedling and seedling mortality rates will be experienced if the seedlings are not able to grow enough to touch the soil surface. For this reason, it will require higher seeding rates.
—Deep seeding guarantees that some will go into secondary dormancy. The volunteer canola seed bank will be able to add the dormant seeds that will not germinate.
—Deep seeding allows weeds emerging at the same time to get ahead of the crop. The best integrated method of managing weeds is shallow seeding. Henry Hernandez, Changzhi (China) revised this article on April 3, 2021.