Avoiding temperature inversions
Protecting sensitive areas
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.
The labels for Enlist One ® and Enlist Duo ® herbicides require a downwind buffer from sensitive areas, which may be a habitat for endangered species. To minimize the chance for an Enlist ® herbicide to come in contact with sensitive areas, you must maintain a 30-foot downwind buffer (in the direction in which the wind is blowing) from any area except: 1 Roads (paved or gravel surfaces) 2 Planted agricultural fields (except those crops mentioned in the susceptible crops section)
3
Agricultural fields that have been prepared for planting
4 Areas covered by the footprint of a building, feed crib or other man-made structure with walls and/ or roof To maintain the required downwind buffer zone, measure wind direction prior to the start of any swath that is within 30 feet of a sensitive area. No application swath can be initiated in or into an area that is within 30 feet of a sensitive area if the wind direction is toward the sensitive area.
WIND DIRECTION 30-FOOT BUFFER (IMPLEMENT WHEN WIND IS BLOWING TOWARD A SENSITIVE AREA)
NO BUFFER REQUIRED IF WIND IS BLOWING AWAY FROM SENSITIVE AREA
WIND DIRECTION
WIND DIRECTION
DO NOT SPRAY OVER BUFFER
OK TO SPRAY
APPLICATION AREA FOR ENLIST ® HERBICIDES
30-FOOT BUFFER
SENSITIVE AREA
APPLICATION AREA FOR ENLIST ® HERBICIDES
SENSITIVE AREA
DO NOT APPLY AN ENLIST ® HERBICIDE IF YOU SUSPECT A TEMPERATURE INVERSION
WARMER AIR
COOLER AIR
27
Made with FlippingBook Digital Proposal Creator