Published on Wednesday, December 2, 2020
All sprayers have common elements, regardless of make or type. Every sprayer includes a tank, pump, boom, and nozzles. Things like flow rate, boom width, and pressure all impact your gallons per acre (GPA) when making applications. This document will help you work through all the formulas so you can make necessary applications at the rate you desire.
GPA = (GPM x 5,940) / (MPH x W)
GPM = (GPA x MPH x W) / (5,940)
Once you have decided on the type and size of nozzle that will work best for you, you need to calibrate your sprayer. Sprayer calibration should take place at the beginning of every season after any mechanical changes are made. Sprayer calibration also provides a good opportunity for you to confirm that your sprayer is performing as expected and that there are no clogged or damaged nozzles.
Example: One nozzle had an output of 4 cups of water in 30 seconds
It’s important to remember that changes in pressure greatly affect nozzle output. With certain nozzles, if you quadruple the pressure, nozzle output doubles. If nozzles are operated outside of the manufacturer recommended range, both pattern and droplet size will be affected.
Your sprayer should be thoroughly rinsed when switching between crops and even crop-specific herbicide trait technologies. Some herbicides are more prone to contaminate future applications. Products such as atrazine, dry products, and many growth regulators will remain in the system unless a proper cleanout procedure is followed. Some products will specify the required cleanout procedures so as always, refer to the appropriate label for that process. Generally, a triple-rinse procedure will provide a sufficiently clean sprayer system.
Proper cleanout measures are important for tendering equipment and transfer pumps in addition to the sprayer itself. These processes can seem confusing and time consuming, but proper preparation can help you avoid any issues that may cost you time and money in the future.
Author: Alex Long
Categories: Agronomy, Agronomy Talk