Considerable agitation is necessary to keep wettable powders in suspension. Hardened stainless steel and nylon nozzles are more resistant to wear from the application of wettable powders than brass nozzles. Tanks made of aluminum, fiberglass or other corrosion resistant materials will reduce the amount of nozzle clogging. Some herbicides may not be used in unlined steel tanks. Be sure that the water used as the spray solution is free from trash and other foreign material, particularly mud or soil particles.
Correct calibration is of utmost importance.
Excess rates may cause injury to the applied crop, injury from excess residue to succeeding crops, and increase herbicide costs. Less than recommended rates will probably result in unsatisfactory weed control. Read the label and know that you are applying only the recommended amount.