Avoiding Temperature Inversions
A temperature inversion occurs when a layer of warm air covers a layer of cooler air and acts like a lid, preventing the cooler air from rising and dissipating into the upper atmosphere. During a temperature inversion, spray particles can become trapped in the warmer layer of air and stay suspended until wind movement increases, resulting in off-target movement. Never spray if you suspect a temperature inversion is present. You run the risk of damaging susceptible plants in nearby fields, lawns and gardens. Wait until later in the day and check again for a more favorable application environment. Before Every Application, Use Steps Like These To Make Sure A Temperature Inversion Is Not Occurring:
• Monitor temperatures by using weather apps on your smartphone when planning an application and always check conditions in the field. If the temperature is within 5 degrees of the overnight low, closely check wind speed and particle movement in the field. • Measure wind speed by using an anemometer. If wind is less than 3 mph, do not spray. • Use smoke or powder to indicate particle movement. The smoke or powder should drift
gently with the wind. If it gathers in a stationary, suspended cloud, that indicates a temperature inversion — do not spray. • Measure the temperature at ground level (approximately 3 feet) and at 7 feet above ground. If the difference is more than a few (3-4) degrees, it is considered an inversion.
Do Not Apply An Enlist ® Herbicide If You Suspect A Temperature Inversion
WARMER AIR
COOLER AIR
SOYBEAN FIELD
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