A maize crop provides a very open canopy to begin with allowing for great coverage using the Defy 3D Nozzle at pre- and post-emergence. As the crop moves through the growth stages the canopy covers and the height differential between the target and the boom height increases. This increases the chance of herbicide been intercepted on route to the target.
|Timing||Water volume (l/ha)*||Forward speed||Best nozzle||Reduced drift option|
|Pre-em herbicides||100 and above||>12 km/h||3D nozzle alternating forwards and back||AMISTAR nozzle|
|Post-em herbicides||100 and above||>12 km/h (slow down for heavily shaded weeds)||3D nozzle or Potato nozzle alternating forwards and back||3D nozzle (or Potato nozzle)|
*Please refer to the product label for water volumes. Growers can reduce water volumes as long as they adhere to the HSE/DEFRA Code of Practice for Using Plant Protection Products. Please refer to paragraph 4.6.4, page 81 of the HSE/DEFRA Code of Practice for Using Plant Protection Products.
Angled nozzles improve coverage around clods
For optimum pre-emergence application, angled nozzles alternated forward and backward along the spray boom can help give better coverage of cloddy soils. It also helps to reduce risk of drift.
Targeting weeds in the growing crop
As the maize crop increases in size, so does the amount of herbicide spray that it intercepts at the time of application - thus
significantly reducing the dose targeted weeds receive. Again, angled nozzles alternated forwards and backwards along the spray boom improve spray penetration of the canopy and target weeds more effectively.