In the first of a series of exclusive EIO application advice videos Syngenta application specialist, Scott Cockburn, explains how to get the most effective weed control when spraying off stale seedbeds prior to drilling.
In the face of increasing resistance to selective products, making the best use of stale seedbeds to control weeds with glyphosate provides the best start for the weed control regime.
Start by making a stale seedbed, advises Scott: “This takes time and patience. Aim to leave the field as long as possible, to achieve maximum germination of weeds and volunteers before spraying.”
Use shallow cultivations to disturb the surface, kill small weed plants and encourage a second flush to germinate. “Again, leave the field for as long as possible before spraying off with an application of glyphosate. This process should be repeated as many times as possible, to fit in with other cultural controls such as delayed drilling,” he says.
Key application areas
“Glyphosate’s systemic action means it takes only one drop to kill the target plant. But to get the most out of every application, pay close attention to some key areas,” he advises.
- Boom height – 50cm above the target.
This provides the best coverage with the nozzles and reduces the risk of drift and ensures the maximum amount hits the target.
- Forward speed – less than 12km/hr.
This maintains boom stability, ensuring it stays at 50cm.
- Nozzle selection – Grassweeds present a small target and angled nozzles provide better deposition on the plant.
In ideal spray conditions a nozzle such as the 3D, alternated forwards and backwards, will deliver optimum efficacy.
In compromised conditions 90% drift reduction nozzles are proven to work very effectively, and there is now a wide choice on the market. These nozzles produce a much coarser droplet and help to reduce the risk of drift.
Top tips for stale seedbed spraying
- Employ cultural control methods
- Be patient and create the best stale seedbeds
- Use the best application techniques:
- Maintain a 50cm boom height
- 12km/hr forward speed or less
- Nozzle choice – select the best nozzle for conditions
- Water volumes of 100-125 litres/ha