Avoid drilling between Mid-September and Mid-October WHERE BLACKGRASS POPULATIONS ARE HIGH. This is when the main flush of black grass occurs.
Delaying drilling until Mid-October results in :
- 33% Reduction in Black Grass plants/m²
- 49% Less Black Grass heads/m²
- 29% Increase in Black Grass control from residual herbicides
By delaying drilling, not only do you avoid the main flush of grass weeds, but soil temperatures are lower resulting in slower weed growth and greater time for the uptake of herbicides and more persistence
Seed Rates and Depth
Adjust variable seed rates to suit seed bed conditions on the day of drilling. Where black grass populations are bad consider increasing seed rates up to 30% to maximise crop competition. This should be discussed with your agronomist.
- Where possible aim to achieve a fine, firm seedbed. Ideally this should be rolled, however we appreciate this is not always possible. Avoid rolling where seedbeds are likely to cap.
- Seed should be covered by a minimum of 32mm of soil to ensure the roots are away from the top 10-20mm pre-emergence layer which may cause crop damage.
- Aim for good precision and consistency of seed depth. This is often the cause for poor crop establishment.
- Tyre Pressures should be kept below 1 Bar, particularly where farms are aiming to direct drill. Where more pressure is exerted on the soil, roots will often struggle to penetrate the soil.