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Publication #ENH90

Pesticide Calibration Formulas and Information1

J. Bryan Unruh2

Calibration Formulas

For any change in travel speed (MPH), calculate the resulting GPA2 by using:

Acres Covered Per Hour

Gallons Per Acre (GPA)

Gallons Per 1000 Square Feet

Ounces Per 1000 Square Feet

Gallons Per Minute (GPM)

Gallons Per Minute (GPM) Per Nozzle

Minute Per Acre

Minutes Per Load

Travel Speed (Miles Per Hour, MPH)

See Table 1.

Table 1. 

Time (seconds) required to cover a specific distance to obtain a desired speed (mph).

 

Time required (seconds) to travel a distance of

Desired MPH

Feet per minute

100 ft

200 ft

300 ft

2.0

176

34

68

102

2.5

220

27

54

81

3.0

264

23

45

68

3.5

308

20

39

58

4.0

352

17

43

51

4.5

395

15

30

45

5.0

440

14

27

41

6.0

528

--

23

34

7.0

616

--

19

29

8.0

704

--

17

26

9.0

792

--

15

23

Acres Covered Per Tank

Material Needed Per Tank

Flow Rate (As Influenced by Pressure)

Calculate the Resulting GPA.

Helpful Calculations and Formulas

Rectangle, Square, or Parallelogram

Trapezoid

Circle

Sphere

Triangle

Cylinder

Finding Tank Capacity (Gallons)

Cylindrical Tanks

Rectangular Tanks

Elliptical Tanks

Fluid Application

PESTICIDE APPLICATION RECORD

Pounds (lb) Commercial Material to Use Per Tank

PPM (Parts Per Million)

Pounds Active Ingredient (lb ai) to Use Per Tank

Pounds (lb) Commercial Material to Use Per Tank

Fluid Ounces (fl oz) to Use Per Tank

Gallons (gal) Commercial Material for Total Treated Acres

Table 2. 

Approximate Rates of Application Equivalents.

Weights

Liquid

1 oz/ft2 = 2722.5 lbs/A

1 oz/1000 ft2 = 43.56 oz/A = 1.4 qt/A

1 oz/yd2 = 302.5 lbs/A

1 pt/1000 ft2 = 5.4 gal/A

1 oz/100 ft2 = 27.2 lbs/A

100 gal/A = 2.3 gal/1000 ft2 = 1 qt/100ft2

1 oz/1000 ft2 = 43.46 oz/A = 2.72 lbs/A

 

1 lb/A = 1 oz/2733 ft2 = 8.5 g/1000 ft2

100 lb/A = 2.5 lb/1000 ft2

Footnotes

1.

This document is ENH90, one of a series of the Environmental Horticulture Department, UF/IFAS Extension. Original publication date November 1993. Revised September 2006. Reviewed December 2014. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

J. Bryan Unruh, assistant professor, Extension turf specialist, Environmental Horticulture Department, West Florida Research and Education Center, UF/IFAS Extension, Gainesville, FL 32611.

No liability is assumed by the author or the University of Florida for the use of formulas in this publication.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.