Modification to the default assumptions for adjustment of spray plume height and dose adjustment calculation (draft document)

• The default dose adjustment calculation method uses some simplifying assumptions (i.e. switching off/on the upper-most pair of nozzles gives a pro rata adjustment of both the spray plume height and applied dose rate).
• However, some sprayers use nozzles of different size with height and this modifies the default dose adjustment calculation.
• Also, if pressure losses are excessive then the default dose adjustment calculation method will need to be corrected.
• The following look-up table is used to correct default assumptions and methods.