Spray Equipment Calibration Flashcards
6 cards from real GROWSAFE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Spray Equipment Calibration flashcards as text
What does 'L/ha' mean in the context of boom sprayer application rates?
Answer: Litres of spray solution applied per hectare of ground area
L/ha (litres per hectare) is the standard measure of application rate for boom sprayers, indicating the total volume of spray solution (including water carrier) applied to each hectare of ground.
If a calibration check reveals that nozzles are applying 15% more than the target rate, what action should be taken?
Answer: Replace the nozzles or reduce pressure to bring the output within tolerance before continuing application
A 15% overrun exceeds the acceptable 5-10% tolerance. Continued spraying at this rate would result in over-application of product — nozzle replacement or pressure adjustment is required.
What is the purpose of filter screens in a boom sprayer?
Answer: To prevent debris from blocking nozzle orifices, maintaining consistent flow rate and spray pattern
Filter screens catch debris from the water supply and product mix that could block nozzle orifices. Blocked nozzles deliver uneven application rates and patterns.
How does increasing travel speed affect the application rate of a boom sprayer?
Answer: Increasing travel speed reduces the application rate (L/ha) if nozzle flow rate remains constant
Application rate equals nozzle flow rate divided by (speed × spacing). If speed increases and flow rate stays the same, fewer litres are applied per hectare — the rate decreases.
What is a 'gravity check' or 'static calibration' test for nozzles?
Answer: Measuring nozzle output at a set pressure with the tractor stationary to compare against manufacturer's rated output
A static calibration test measures individual nozzle output at rated pressure while the tractor is stationary, providing a controlled comparison against the manufacturer's specified flow rate.
What must happen to rinse water from sprayer cleaning after a pesticide application?
Answer: It must be applied to a treated area or disposed of as chemical waste — never poured down a drain or onto bare soil near waterways
Rinse water contains agrichemical residues and must be disposed of appropriately — either by applying to a treated area at a dilute rate, or as chemical waste. Discharge to drains or waterways is prohibited.