Group Title: Mimeo report - University of Florida Everglades Experiment Station ; 61- 2
Title: Calibration suggestions for dry and liquid herbicide application
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Permanent Link: http://ufdc.ufl.edu/UF00067504/00001
 Material Information
Title: Calibration suggestions for dry and liquid herbicide application
Series Title: Everglades Station Mimeo Report
Physical Description: 6 leaves : ; 29 cm.
Language: English
Creator: Orsenigo, J. R
Everglades Experiment Station
Publisher: Everglades Experiment Station
Place of Publication: Belle Glade Fla
Publication Date: 1960
 Subjects
Subject: Herbicides -- Florida   ( lcsh )
Spraying equipment -- Calibration -- Florida   ( lcsh )
Genre: non-fiction   ( marcgt )
 Notes
Statement of Responsibility: J.R. Orsenigo.
General Note: "15 September 1960."
 Record Information
Bibliographic ID: UF00067504
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 64665973

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EVERGLADES STATION MIfEO REPORT 61-2


CALIBRATION SUGGESTIONS FOR DRY AND LIQUID HERBICIDE APPLICATION


J. R. Orsenigo



The following calibration tables and procedures have been prepared
for the 8th Annual Florida Turf-Grass Management Conference. This material
is not a complete review of all calibration methods. It is intended to
provide equipment operators with a means of accurate set up for their equip-
ment as well as a guide which will assist repeated periodic "checks" on ap-
plicator functioning.

Several simple procedures are described with alternate methods for
comparison.


1. Assistant Horticulturist, Everglades Experiment Station, University of
Florida, Belle Glade, Florida.


15 September 1960






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








Table 2. DRY CHEMICAL APPLICATOR CALIBRATION: ALTERNATIVE PROCEDURE

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

2. JACK UP APPLICATOR SO THAT WHEELS DO NOT TOUCH THE GROUND. TIE A PIECE OF
CLOTH (or paint) TO ONE SPOKE OF WHEEL.

3. PLACE A PIECE OF CANVAS OR SHEET METAL UNDER THE DELIVERY OPENINGS TO
CATCH THE CHEMICAL WHEN IT IS DISPENSED.

4. OPEN SHUT-OFF CONTROL TO PERMIT THE CHEMICAL TO FLOW AND MAKE 43 COMPLETE
REVOLUTIONS OF THE DRIVE WHEELS.

5. SHUT OFF FLOW FROM HOPPER AND WEIGH THE CHEMICAL DELIVERED DURING THE 43
DRIVE WHEEL REVOLUTIONS.

6. CALCULATE THE AMOUNT OF CHEMICAL DISCHARGED ON A PER ACRE BASIS WITH THE
FOLLOWING FORMULA:

POUNDS PER ACRE POUNDS DISCHARGED x 1000
DRY CHEMICAL SPREADER WIDTH feet) x WHEEL CIRCUMFERENCE (feet)


THIS VALUE WILL BE POUNDS PER ACRE OF FORMULATED CHEMICAL APPLIED. TO DETER-
MINE AMOUNT OF ACTIVE INGREDIENT APPLIED MULTIPLY POUNDS PER ACRE ABOVE
BY PER CENT ACTIVE CONCENTRATION AND DIVIDE BY 100, AS FOLLOWS:

POUNDS PER ACRE ACTIVE = pounds per acre formulated chemical x % act.
100
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.

10. CHECK CALIBRATION BY OBSERVING AMOUNT OF CHEMICAL APPLIED TO A FIELD OF
IGKOWN ACREAGE.

Example: A dry chemical applicator is jacked up and the drive wheel
is turned through 43 complete revolutions. The wheel cir-
cumference is 9 feet and the spreader width is 8 feet. The
chemical delivered in 43 wheel revolutions is 29 pounds.

Pounds per acre dry chemical = 20 x 1000 = 277 lb/A
8' x9'
If the chemical contains 2001 active ingredients:

Pounds active ingredient per acre = 277 x 20 = 55.4 lb/A
100







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'








Table 4.


HERBICIDE SPRAYER CALIBRATION TABLE: BRUSH BOOM FOR BROADCAST SPRAYING

TO USE THIS TABLE: have sprayer equipped with proper nozzle tips and with tips, tractor speed and
spraying pressure adjusted as for field operation. Then, operate unit in field and collect spray
liquid discharged by several nozzle tips over a measured distance of 300 ft.
Average quantity of liquid sprayed per tip in OUNCES. Locate this figure in left-hand column
of table and read directly the gallons per acre rate under the nozzle spacing column for your boom.

AMOUNT OF SPRAY GALLONS PER ACRE APPLIED
DELIVERED BY ONE AT NOZZLE SPACINGS OF:
NOZZLE IN 300 Ft. 15 inches 18 inches 21 inches

8 ounces 7.3 6.1 5.2
10 9.1 7.6 6.5
12 10.9 9.1 7.8
14 12.7 10.6 9.1
PT 16 14.5 12.1 10.4
18 16.3 13.6 11.7
20 18.2 15.1 13.0
22 20.0 16.6 14.3
24 21.8 18.2 15.6
26 23.6 19.7 16.9
28 25.4 21.2 18.2
30 27.2 22.7 19.5
QT 32 29.0 24.2 20.8

Example: When run down the field at operating speed and pressure a sprayer has an average
nozzle tip delivery of 26 ounces of solution in 300 ft. Nozzles tips are spaced 18 in.
apart on the boom. The gallons per acre rate is found in the 18 inch column opposite
26 ounces: 19.7 gpa.










REDUCED DOSAGE TABLE FOR


APPLICATION OF HERBICIDES TO SMALL AREAS


Label concentration in
active ingredient or
acid equivalent
Percent Pounds/gal


0.5
1.0
2.0
3.0
4.0
5.0
6.0


Quantity of liquid herbicide product to
add to 1 gallon of water to treat
1000 sq. ft. at rate of 1 pound/acre
Ounces cc or ml Tablespoons


6.2
3.1
1.5
1.0
0.7
0.6
0.5


174
87
43
29
22
17
14


12.5
6.2
3.1
2.1
1.5
1.2
1.0


To apply 1/2 lb/A rate use one-half the amounts shown in table.
To determine quantity of herbicide for rates greater than
1 lb/A multiply the desired rate times the amount shown in the
table for the given concentration.


Table 5.




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