Herbicide or Pesticide Mixing Formulas

The following formulas may be helpful when mixing herbicides or pesticides:
1. The percent of active ingredient in a spray mixture:

2. The pounds of wettable powder needed to mix a spray containing a given percentage of active ingredient:

3. The gallons of concentrate needed to mix a spray containing a given percentage of active ingredient:

4. The pounds of concentrate to use to prepare a solution or suspension on a weight-to-weight basis:

Conversion Factors

Some conversion factors of importance in herbicide or pesticide mixing are:

Measures

1 tablespoonful =3 teaspoonfuls
2 tablespoonfuls =1 fluid ounce
16 tablespoonfuls =1 cup
8 fluid ounces =1 cup
2 cups =1 pint
16 fluid ounces =1 pint
16 cups =1 gallon
128 fluid ounces =1 gallon
3785.3 ccs. =1 gallon

Weights

1 gallon of pure water weighs 8.345 lbs.
1 gallon of Diesel oil weighs 7.0 lbs.
454 grams equals 1 lb.
1 ounce per square foot = approx. 2722.5 lb/acre
1 ounce per square yard = approx. 302.5 lb/acre
1 lb. per 100 square feet = 435.6 lb/acre
1 pint per square rod = 20 gal. per acre
1 gram per square feet = approx. 96 lb/acre