Deep seeding in canola
Seeding too deep will delay germination, thus reducing seed yield and oil content.
What to look for
- Pale and weaker plants that are more frequent in softer soil areas or along seeding rows.
- Early sown crops are less affected than those sown in cold wet conditions
- Seedlings have delayed emergence and are more susceptible to waterlogging and root disease.
- Emerged plants have a longer hypocotyl, and smaller cotyledons with pale margins.
- Very deep sown seedlings may fail to emerge.
What else could it be
- Canola seed sown to a depth of 12-25 mm into a firm, moist seedbed germinates rapidly with a high emergence percentage.
- On sandy soils or where the topsoil dries quickly, planting can be slightly deeper, around 30 mm.
- Seed larger than 2 mm diameter (5 mg) will also help when sowing deeper.
- Late sown canola in June-July should be sown at 1-2 cm for rapid emergence.
- Be wary of varying soil types within paddocks. Seeding equipment may sink further in sandy soils, changing the seeding depth.
How can it be monitored?
- Test the seed depth with a higher seed rate to make finding the seed easier, but don't forget to change back to normal seed rate.
Where to go for expert help
Page last updated: Friday, 17 April 2015 - 11:52am