Table 1. DRY CHEMICAL APPLICATOR CALIBRATION: GENERAL PROCEDURE

1. ADJUST DELIVERY OPENINGS ON APPLICATOR AT ESTIMATED OR APPROXIMATE SETTING
 AND FILL HOPPER WITH A WEIGHED AMOUNT OF CHEMICAL TO BE APPLIED.

 2. SET TRACTOR OR UNIT SPEED AS IT WILL BE OPERATED IN FIELD-.

 3. OPERATE UNIT OVER A MEASURED COURSE OF SEVERAL HUNDRED YARDS IN FIELD:
 THE DRY CHEMICAL CAN BE COLLECTED BY SUSPENDING A TROUGH OR PAN
 BENEATH THE DELIVERY OPENINGS.

4. WEIGH' THE AMOUNT OF CHEMICAL REMAINING IN THE HOPPER AND CALCULATE THE
 AMOUNT OF DRY CHEMICAL APPLIED AS FOLLOWS: ORIGINAL CHEMICAL LOADED
 IN HOPPER MINUS CHEMICAL REMAINING IN HOPPER EQUALS AMOUNT OF CHEMICAL
 APPLIED.

5. CALCULATE AREA TREATED: WIDTH OF APPLICATOR SWATH TIMES DISTANCE COVERED
 EQUALS AREA OF MEASURED COURSE IN SQUARE FEET.

6. FROM 4 and 5 CALCULATE AMOUNT OF DRY CHEMICAL APPLIED PER ACRE AS FOLLOWS:
 SP 43560 x pounds applied over course
 POUNDS PER ACRE = r measure course in square ree
 THIS VALUE WILL BE POUNDS PER ACRE OF FORMULATED CHEMICAL APPLIED.
 TO DETERMINE AMOUNT OF ACTIVE INGREDIENT APPLIED MULTIPLY POUNDS PER
 ACRE BY PER CENT ACTIVE CONCENTRATION AND DIVIDE BY 100, AS FOLLOWS:
 POUNDS PER ACRE ACTIVE pounds per acre formulated chemical x % act
 POUNDS PER ACRE ACTIVE100

7. RATE OF APPLICATION IS INCREASED BY WIDER DELIVERY OPENINGS.

8. RATE OF APPLICATION IS DECREASED BY NARROWER DELIVERY OPENINGS.

9. COMPLETE CALIBRATION BY ADJUSTING UNIT AND TESTING UNTIL DESIRED QUANTITY
 OF MATERIAL IS APPLIED.

 Example: A dry chemical applicator is 10 feet wide. When driven over a
 distance of 435 feet it distributed 20 pounds of chemical at a
 given delivery opening.

 POUNDS PER ACRE = 4350 --=-2 200 lb/A formulated chemical

 If the active ingredient concentration was 20%, the rate of
 active material applied per acre was:

 POUNDS PER ACRE 00 lb x 20 = 40 Ib/A active
 ACTIVE INGREDIENT 100