Careful blackgrass sampling needed to give consistent results

Sampling blackgrass from patches of around 20 sq m should give consistent resistance status results, Lynn Tatnell, a weed scientist from ADAS said.

Detailed research on patch sampling were made in a recent DEFRA-funded LINK project on herbicide resistance, she explained.

“The results suggested that if you sample within 20sqm the results should be representative of that patch. But the results start to get more variable if you’re sampling from patches 20m to 50m apart.”

But how much growers sampled ultimately came down to cost, she recognised. That meant if growers were only doing one sample from a field then it was better to sample from individual patches across the field and then take a representative sub-sample than just sampling from one patch in the field.

More stories from ADAS Boxworth open day:

Significant rain needed to prevent yield loss
Stacking pre-emergence blackgrass herbicides might be effective
Triticale could be alternative second cereal
Nitrous oxide emissions measured
Applying nitrogen to flowering oilseed rape could increase yields

Futures markets and commodity risk management online course:

  • Risk management strategies for a more predictable financial performance
  • Educated conversations when collaborating with your advisors
  • Negotiate better prices with your grain merchants

View course

Using contractors saves you time and money. Now you can book, track and pay all in one place. Register for early access today.

Find out more