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Nozzle Selection for Spraying Herbicides Spray Smart-February 2, 2006

Nozzle Selection for Spraying Herbicides Spray Smart-February 2, 2006. Curtis Rainbolt, Ron Rice, Les Baucum, and Darrin Parmenter University of Florida/IFAS. Spray Nozzle Basics. Spray patterns-Flat Fan Sprays heaviest at the center and dissipates towards the outer edges

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Nozzle Selection for Spraying Herbicides Spray Smart-February 2, 2006

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  1. Nozzle Selection for Spraying HerbicidesSpray Smart-February 2, 2006 Curtis Rainbolt, Ron Rice, Les Baucum, and Darrin Parmenter University of Florida/IFAS

  2. Spray Nozzle Basics • Spray patterns-Flat Fan • Sprays heaviest at the center and dissipates towards the outer edges • Uniform distribution is achieved through proper boom height and nozzle spacing • Used for broadcast spraying

  3. Spray Nozzle Basics • Spray patterns-Even Fan • Modified flat fan • Used for band spraying • Non-tapered pattern provides even coverage without overlapping

  4. Other Nozzle Types • Hollow Cone • Forms a round ring pattern • Used for specialty and direct spraying • Creates a very fine droplet size (atomized) • Full Cone • Creates a full round pattern • Used for specialty applications

  5. Air Induction Nozzles • Create large air filled droplets that are less prone to drift • Can reduce drift by as much as 50% • Typically used for broadcast applications • Require overlap to create a uniform pattern

  6. Effect of Pressure on Output • Increasing then pressure 4 times doubles the flow rate • Higher pressure increases droplet size • High pressure increases nozzle wear

  7. Selecting the Right Nozzle • What and how are you spraying? • What is your tolerance to drift? • What is the pressure range of the sprayer? • What is the nozzle spacing on the boom?

  8. What and how are you spraying? • Herbicides, fungicides, insecticides • Soil incorporated, preemergence, postemergence • Broadcast, banded, direct • Refer to a manufacturers nozzle guide • Herbicide labels often recommend nozzle types and gallons per acre

  9. Tolerance to drift • Do you apply near residential areas? • Do you apply near different highly sensitive crops? • Have you had a drift complaint in the past? • Do time restrictions result in your spraying in less than ideal conditions

  10. Nozzle Materials • Ceramic-wear resistant, typically provide a constant flow rate over a longer time period • Brass- wear quickly, flow rates can increase by as much as 10-15% after 50 hrs of use • Combinations of plastic and stainless steel usually cost less than ceramic and last longer than brass

  11. Effect of Worn Nozzles

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