Applying hexazinone to standing water will injure blueberries. Warm temperatures increase hexazinone's weed-killing action because at high temperatures plant growth and activity increase. The faster the plant grows, the quicker the herbicide is picked up and moved through the plant. Applying hexazinone to frozen soil may cause it to run off if rain occurs before the soil thaws. Soils with high organic content adsorb hexazinone and reduce its effectiveness.
Calibration is very important to get the right rates.
Adjust output with tractor speed for the desired rate. Nozzles can become partially or totally clogged. Improper cleaning can cause nozzles to become misshapen or enlarged. Nozzle holes also enlarge with use because of the abrasive action of sprays. When the sprayer is too high, overlapping occurs.