WEED-IT, just when you thought you were off the hook - Part 11.
On Thursday this week, one of my readers regarding overlapping nozzle rates on his vintage WEED-IT asked

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Articles by Dave about spraying precisely, safely and effectively from a mature perspective.
On Thursday this week, one of my readers regarding overlapping nozzle rates on his vintage WEED-IT asked
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This is just to follow on with the discussion relating to nozzle spray widths. Let's compare the spray widths of 110°, 80° and 60° nozzles.
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The first thing to understand about how the CBEE determines which nozzles to activate is this. The CBEE will turn on nozzles where a weed appears in the footprint (spray width) of the nozzle as specified in the configuration settings.
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All new BATCH-IT is a batching and reporting App for single spot applications. Head scratching be gone!
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Understanding the relationship between isolated and overlapping nozzles is vital for correct nozzle selection. Unless you get that right and are clear on what your target objectives are, chemical batching and post job reporting will be suspect as well.
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The See & Spray Nozzle Pocket Guide provides all the information to work out a per nozzle flow rate required based on band width for single spot (isolated nozzle) applications. There are two sets of tables that provide theoretical values which should be used in place of nozzle spacing in the final worksheet.
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It has been quite a journey and I have ruffled a few feathers along the way in my quest to bring some accuracy and precision to the complex art of setting up a sprayer for isolated nozzle operation, that is to say Single-Spot Spraying.
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Since all spot sprayers are not the same, I'm going to classify them into three main groups. I'm not concerned with cameras or sensors just the rate controller and nozzles. The spraying bits.
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Based on my assessment and absent any evidence to the contrary (after publishing this information widely), it appears that EVERY single spot capable camera system, at least in Australia has a rate controller calibrating on blanket, not spot rates.
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In the last two episodes we’ve discussed the problems associated with switching from side safety to single spot, that is halving of the rate (approximately) and understanding that where multiple nozzles engage in single spot mode the rate between them doubles (approximately)
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Last week I wrote to you about what happens when you switch your spot spraying system from side safety (multiple nozzles) to single spot, that your application rate for isolated nozzles could drop off by up to half or even more depending on nozzle height, size and angle.
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When you take a spot spraying system and attach it to a boom sprayer, the expectation is that it will just work like normal. Well if two or more adjacent nozzles are firing, it probably does.
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Q&A with Gary Dorr of the APVMA on rate calculation and nozzle selection for Optical Spot Spray Technologies (OSST)
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See & Spray Guidelines - Superseded on 14/03/2024 by OOST label rate compliance
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Duty Cycle Apps and Spray Calculators
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What gripes a nozzle guy!
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110° nozzles on spot-sprayers - Really?
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Determining Sprayed Width for L/ha Applications.
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Spot-Spray basics.
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Dave on Optical Spot Sprayer Nozzles
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Bitcoin accounting for SME's
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PWM v Air Induction for Drift Management & Coverage
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Practical Guide to 2,4-D Spray Quality Compliance
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Dave’s Concise Pulse Width Modulation Guide
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Dave’s Concise Fungicide Spraying Guide
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Dave’s Concise Stubble Spraying Guide
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Dave’s Concise Spray Drift Management Guide
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Explaining the Spray Quality Standard ASABE S572.1
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An article about stubble jet.
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An article about stopping weeds in wheel tracks.
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Coarse sprays.
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