Guard against surface run-off

Fine seedbeds and heavy rain showers during the spring can increase the risk of pesticides reaching water warns the Voluntary Initiative’s H2OK? – Keep it Clean campaign.

“At this time of the year soils are normally at field capacity, and the most likely cause of pesticide residues in surface water would be from surface run-off from wet fields,” says CPA’s VI Manager Patrick Goldsworthy. “The good news is that dry soil conditions across the country have reduced the risk of pesticide run-off this spring but growers still need to be vigilant rather than complacent.

“Dry soils can still pose risks so it’s important that growers are aware that soil and pesticides can run off following heavy showers. Last year Environment Agency data showed there had been a 19% improvement in surface water, we need this ‘attention to detail’ to ensure good progress by UK farmers continues.”

Before spraying check soil moisture status, drainage and weather forecasts to decide if applications will be safe and effective. The essential message is if drains are running, or likely to run due to imminent heavy rainfall or showers, delay application.

If in doubt seek advice or check the Voluntary Initiative website www.voluntaryinitiative.org.uk. Spring herbicide decision trees are available, providing step-by-step advice on the decision-making process.

The main area of threat this spring are fields with a very fine seedbed that could be prone to soil capping and surface erosion particularly those on slopes.

“Avoid overworking seedbeds. Fine seedbeds are more likely to cap causing surface water-logging and faster run-off, so leave them slightly cloddy.” advises Mr Goldsworthy.

He warns that measures to reduce pesticide run-off apply to all fields. Water and soil can still run-off from treated areas into other fields or onto roads and tracks where they can directly enter a watercourse.