Today we will showing you how to determine the correct nozzle tip sizes for See and Spray Select.
For more See and Spray Select videos, visit the John Deere YouTube Channel.
Before starting any procedures, it is important to recognize safety information,
understand safety signals, wear recommended personal protective
equipment, and be familiar with your operator’s manual.
Depending on what ExactApply configuration the operator is using for See and Spray Select,
this will change the way to calculate your nozzle tip sizes to achieve desired rates.
There are 3 different ExactApply setups for See and Spray Select:
See and Spraying out of Nozzle B only, A+B WITHOUT auto-pulsing where nozzle A broadcasts and nozzle
B See and Sprays, and A+B WITH auto-pulsing where nozzle A broadcasts with pulsing functionality
and nozzle B See and Sprays. After deciding which of these 3 configurations the operator would like
to spray with, then we can calculate our nozzle tip sizes for Nozzle B then Nozzle A if necessary.
Now that we have enabled See and Spray, let’s walk through an example where the
operator wants to See and Spray out of nozzle B only. Let’s say the operator wants to spray
at a desired See and Spray rate of 20 gallons per acre while trying to
maintain a 10 mile per hour operating speed on a Sprayer with 15 inch nozzle spacing.
To calculate our nozzle B tip size flow rate in gallons per minute,
one would take the See and Spray rate of 20 gallons per acre and multiply that by both our 10
mile per hour operating speed and 15 inch nozzle spacing. Then, divide this by a constant, 5,940.
This equates a nozzle B flow rate of 0.51 gallons per minute. After referencing the ExactApply
nozzle selection chart within the John Deere Sales Manual, this equates to a 06 Grey Tip at 30 PSI.
Let’s walk through an example where the operator wants to spray with A+B WITHOUT Auto-pulsing
where Nozzle B See and Sprays and Nozzle A Broadcasts with auto pulsing turned OFF.
Let’s say the operator wants to spray at a desired See and Spray rate of 20 gallons per acre out of
Nozzle B and a Desired Traditional Broadcast Rate of 10 Gallons per acre out of Nozzle A.
We will also use our previously calculated 06 Grey Nozzle B
Tip Size since the See and Spray Rate is the same from our last example.
To calculate our nozzle A Tip Size, take the Nozzle A Broadcast Rate of 10 Gallons
per Acre and divide that by our Nozzle B See and Spray Rate of 20 Gallons per Acre. Then,
multiply that by our previously calculated Nozzle B Tip Size of
06. This equates to Nozzle A Tip Size of 03, which is a Blue Tip.
Let’s walk through an example where the operator wants to spray with A+B
WITH Auto-pulsing where Nozzle B See and Sprays and Nozzle A Broadcasts with auto pulsing enabled.
Let’s say the operator wants to spray at a desired See and Spray rate of 20 gallons per acre out of
Nozzle B and a Desired Traditional Broadcast Rate of 10 Gallons per acre out of Nozzle A. The
operator also desires 65% duty cycle for optimum turn compensation while pulsing from nozzle A.
We will also use our previously calculated 06 Grey
Nozzle B Tip Size since the See and Spray Rate is the same from our first example.
To calculate our nozzle A Tip Size, take the Nozzle A Broadcast Rate of 10 Gallons per Acre
and divide that by our Nozzle B See and Spray Rate of 20 Gallons per Acre.
Then, multiply that by our previously calculated Nozzle B Tip Size of 06. Next,
divide this by our 0.65 Desired Duty Cycle Percentage expressed as a decimal. This equates
to a Nozzle A tip size of 4.62, which rounding up equals a 05 Brown Tip for Nozzle A.
For more nozzle tip selection or optimization information,
refer to the John Deere See & Spray Select videos on our YouTube channel, reference the
operator’s manual, or contact your local John Deere dealer. Thank you for choosing John Deere.