Variable Rate Nozzles
By: Kyle Dollins
What Can VRT Be Used For?
Ramp Strips
• Change Rate
every 10 Foot
• Low Speed
J2 Ramper
• Same Rate For
Entire Boom
• Multiple Pumps
• Multiple Valves
Rendal Ramper
Change in Ground Speed
• Slow Down For Rough Spot
• Change Rate For Entire Boom
• Hydraulic Driven Pump
• Electric Driven Pumps
• Solenoid Valves
Change in Recommended Rate
• Green Seeker
• Aerial Maps
• Management Zones
Problems With VRT
• Speed of Change
– 15 mph = 22 ft/sec
– To Treat By Foot
• Rate Must Change in 0.045 seconds
• Nozzle Speed Limits Resolution
• Orifice Flow
– To Double Flow
– Pressure Must Be Quadrupled
Types of Variable Rate
• Change rate of Entire Boom
– Pressure Change
– Stepped Pumps
• Change Rate of Individual Nozzles
– Electronic Controlled Sprayer Nozzles
VariTaget Nozzle
• Spray Speeds 2-20 mph
• 100 psi Max Pressure
• 5 to 40 gpa
• $50 Nozzle
• Adjusted by electronic flow
rate controller
Turbo Drop Nozzle
• $30 Per Nozzle
• 20-120 psi
• 0.07 – 1.73 gpm
• Adjusted by
electronic flow
rate controller
Electric Solenoids
• Three solenoids per Sensor
– 1X
– 2X
– 4X
• Changes rate in 0.1 seconds
• Most Expensive
Questions?