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