The Effect of Pressure Drop on Coverage

Tom at SWDD 2015

In 2015, Tom and Jason ran demonstrations at Ontario’s Southwest Agriculture Crop Diagnostic Days. The 20 minute sessions were designed to explain: The phenomenon of pressure drop, how to measure it, how to correct for it, and how low pressure affects coverage. Although manufacturers of air induction nozzles often rate their performance as low as 15 psi, […]

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Pressure Changes Spray Angles – A Lot!

Soybean demo plot sprayed with a contact herbicide using 110 degree air induction flat fans at 20 psi. The collapsed spray pattern did not overlap sufficiently to burn the entire crop down, leaving a striped pattern and demonstrating the poor coverage.

When a nozzle catalogue states that a nozzle produces an 80˚ or 110˚ fan throughout a given pressure range, the reader (rightfully) assumes it to be true. Unfortunately, this is not always the case. To illustrate this, I assembled a collection of red, flat fan nozzles (‘04s). They represented a variety of spray qualities and […]

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Spray Quality and Volume Matrix

We often write about how valuable water sensitive paper can be to visualize and assess the coverage we’re getting from a specific application method.  A handy reference is this matrix that combines both factors.  Print it and use it in the field to compare what your application method is doing to these relative standards.  On average, […]

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Fungicide Application Basics

Fungicide use appears to be the fastest growing segment of North American crop protection.  Here is some advice on how to get the best bang for the buck. Timing is the most important part of fungicide application. Diseases can develop and spread quickly.  Most fungicides cannot cure a disease infection, they can only protect against […]

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How to Use a Nozzle Flow Chart, With a Surprising Twist

Calibration Chart (US Units)

Undoubtedly, the number one question we get from operators is: “Which nozzle should I get”? Luckily there’s no simple answer, or we wouldn’t have jobs! The reason it’s not simple is because selecting the “right” nozzle for a sprayer is a process. It can be broken down into two steps: identifying the right flow rate […]

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