14 Aug
Drop arms improve spray coverage on field peppers
Posted by Super User

A farm supplier contacted us in early July on behalf of a client with a history of disease control issues in his field pepper operation. He wanted us to calibrate their sprayer and diagnose spray coverage to see if there was room for improvement.

Coverage doesn’t equal efficacy, but it’s generally a reliable indicator. When we arrived at the field the winds were gusting over 15 km/h, which had the potential to create a massive drift issue. We were only spraying water, so it was decided that if we managed decent coverage in those conditions, there would be no need to worry on an acceptable spray day.

The grower traditionally ran two different settings on his sprayer. They were relatively low volumes for a vegetable operation, but the crop was still small at this stage (see image), so we did not propose raising the volume:

  1. TeeJet AITX 11008’s on 50 cm (20″) centres at 11.25 km/h (7 mph) and 3.44 bar (50 psi). That’s 3.35 L/min (0.89 gpm) per nozzle for a total rate of 350 L/ha (37.5 gpa).
  2. TeeJet ConeJet TXVK18’s on 50 cm (20″) centres at 7 km/h (4.5 mph) and 3.44 bar (80 psi). That’s 1.6 L/min (0.42 gpm) per nozzle for a total rate of 275 L/ha (29.5 gpa).