This section consists of 5 modules. In these modules, spray operators are provided an overview of the spraying systems available, details on pulse width modulation (PWM) systems. Specific information is provided on single-line and multi-step systems, shielded sprayers and target-selectable sprayers.

Module 16: Overview of the spraying systems available

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Module 16 provides an overview of the spraying systems available, covering strengths and limitations.

• 16.1 Introduction
• 16.2 Overview of pulse-width modulation
• 16.3 Twin fluid and air-assisted systems
• 16.4 Multi-step booms
• 16.5 Comparison of systems
• 16.6 Summary

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Module 17: Pulse width modulation systems

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Module 17 covers how pulse-width modulation systems work and set-up considerations.

• 17.1 Introduction
• 17.2 Operating principles and terminology
• 17.3 Operational considerations
• 17.4 Nozzle orifice sizes
• 17.5 Summary

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Module 18: Single line and multi-step systems

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Module 18 covers how single-line and multi-step systems work, and set-up considerations.

• 18.1 Operating principle for multi-step systems
• 18.2 Versions of multi-step systems
• 18.3 Operating range for a 4-nozzle multi-step system
• 18.4 Wheel-track nozzles on multi-step systems
• 18.5 Summary

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Module 19: Shielded sprayers

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Module 19 talks about practical issues with shielded sprayers and set-up considerations.

• 19.1 Introduction
• 19.2 Label and legal requirements
• 19.3 Determining the applied rate for banded applications
• 19.4 Nozzle choice and spray quality
• 19.5 Droplet escape and drift potential
• 19.6 Control of the spray system
• 19.7 Practical considerations
• 19.8 Summary

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Module 20: Optical spot sprayers

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This module provides information on optical spot sprayers and considerations for nozzle selection and set-up

• 20.1 Introduction
• 20.2 Systems available in Australia
• 20.3 Controlling the nozzle output
• 20.4 Nozzle type, position and constraints for effective use
• 20.5 Timing and sensitivity
• 20.6 Set-up: standalone or in combination with a broadacre boom?
• 20.7 Points to consider before purchase
• 20.8 Summary

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