Table 3.


 SPRAYER CALIBRATION: GENERAL PROCEDURE


 1. ADJUST NOZZLES, PRESSURE AND TRACTOR SPEED AS THEY WILL BE OPERATED
 IN FIELD.

 2. FILL HERBICIDE TANK WITH WATER.

 3. OPERATE UNIT AS IN NUMBER 1 ABOVE AND SPRAY WATER OVER A MEASURED COURSE
 OF SEVERAL HUNDRED YARDS IN FIELD.

4. DETERMINE AMOUNT OF WATER REQUIRED TO REFILL .TANK TO REPLACE THAT SPRAYED
 OVER MEASURED COURSE.

5. CALCULATE AREA SPRAYED: WIDTH OF BOOM COVERAGE TIMS DISTANCE SPRAYED
 EQUALS AREA OF MEASURED COURSE IN SQUARE FEET.

6. FROM 4 and 5 CALCULATE AMOUNT OF WATER APPLIED PER ACRE AS FOLLOWS:

 GPA = 43560 x gallons sprayed over course
 area of measured course in square feet

7. GALLONS OF SPRAY APPLIED PER ACRE CAN BE DECREASED BY: SMALLER NOZZLE
 TIPS, LESS SPRAYING PRESSURE, OR FASTER UNIT SPEED.

8. GALLONS OF SPRAY APPLIED PER ACRE CAN BE INCREASED BY: LARGER NOZZLE
 TIPS, HIGHER SPRAYING PRESSURE, OR SLOWER UNIT SPEED.

9. COMPLETE CALIBRATION BY ADJUSTING AND TESTING UNIT UNTIL IT APPLIES
 DESIRED GALLONS PER ACRE: THEN, ADD DESIRED QUANTITY OF HERBICIDE
 PER ACRE TO AMOUNT OF WATER SPRAYED PER ACRE BY THE UNIT.

 Example: A sprayer covers a swath 10 feet wide. When diiven over a
 distance of 435 feet it sprayed 2 gallons of solution at the
 operating speed, pressure and nozzle size.

 GALLONS PER ACRE = 43560 x 2 gal. = 20 gpa
 lO' x 435'