Calibration of Boom Spray Equipment.
1/ To calculate the application rate of a boom, the following calculation can be used:
An example is included for your benefit:
A boom has a total output of 24 litres per minute from all nozzles, travels 200 mtrs per minute and has a swath width (effective spray width0 of 12 mtrs.
Total Nozzle Output ÷ Distance travelled ÷ Swath width x 10,000 = Liquid (water + chemical) Applic Rate
(in lts/min) ÷ (in mtrs/min) ÷ (in mtrs) × 10,000 = (in lts/ha)
2/ To calculate the amount of chemical to be put in a tank, the following calculation can be used:
Tank size ÷ Liquid App Rate x Chemical App Rate = Tot Chem to be added to Tank
(lts) (lts/ha) (lts or kgs/ha) (lts or kgs)
(from calculation 1)
Spray Record Sheets.
Spray Record Sheets are included in our Chemical Accreditation Course Manual.
Others are available from Qld DAFF and various QA program managers.