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Show Calibrate sprayers for woods too many farmers, county weed supervisors and others who do spraying are not applying the proper amount of chemical. They are putting put-ting on too much or not enough says Louis A Jensen, Jen-sen, extension agronomist (weeds) Utah State University. Univer-sity. Poor weed control or over application that can seriously Injure crop plants and waste chemicals often result from using sprayers that are not calibrated prop- erly. To correct that problem detailed directions for calibrating a sprayer are given in the 1979 Chemical Weed Control Guide for Utah published as USU Extension Circular 301. The directions given in the guide for sprayer cali- bration and for coping with "arious weed problems were irefully reviewed with weed ipervisors from throughout e state at the 8th Annual ounty Weed Supervisor's orkshop held in Richfield. Jensen stressed that the )ray operator can control e rate of application. The imber of gallons the rayer applies per acre spends on the ground speed id pressure at the nozzles, izzle spacing and the size id shape of the nozzle opens' open-s' . . You need to know the ex- t amount of liquid you are iplying per acre. Then u can include the proper lount of chemical in that lume of liquid. The Weed Control Guide ves directions for cali-ating cali-ating boom sprayers, iall hand or knapsack rayers and large high essure, single nozzle rayers. It lists the var-is var-is herbicides and tells ich are suitable for con-)lling con-)lling weeds in the various DPS. The county weed superiors super-iors received copies of ! guide for their use. Other rsons desiring copies )uld contact their local anty extension office or bulletin room at USU. ' I |