Evaluation of the watchdog weather station to reduce drift from MDOT spray trucks.
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2015-09-01
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Abstract:Wind speed data collected with the Spectrum Watchdog Sprayer Station were compared to data
recorded with a Young 05103-5 anemometer at the Rodney R. Foil Plant Science Research
Center on the Mississippi State University campus June and July, 2014 and 2015. The
manufacturer’s specifications advertise the Sprayer Station wind speed accuracy for wind speeds
less than 12 mph is +1.1 mph and wind speeds greater than 12 mph is +2.3 mph. While the wind
speed data recorded by the Watchdog Sprayer Station followed the same trend as the data
recorded with the Young anemometer, variations in wind speed both above and below that
recorded by the Young anemometer indicate the Watchdog precision is not sufficiently reliable of
the actual wind speed. Wind speed data recorded by the Young anemometer and Watchdog
Sprayer Stations were poorly correlated at 0.61 and 0.49 for collection periods in 2014 and 2015,
respectively. These data indicate the Watchdog Sprayer Station does not measure wind speed
with sufficient reliability to provide a MDOT spray truck driver, a true indication when wind speeds
are above or below safe parameters for spray applications to avoid drift.
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