A Comparison of The International Metric System & The English System of Measurement  




Conversion Table  
Multiply To Obtain  Multiply To Obtain  Multiply To Obtain  



Conversion Table 


Most of the commercial containers of
insecticides, fungicides, etc., give directions on using the chemical in 100
gallons of water. The following table can be used to determine the
quantity of chemical when using less than 100 gallons of spray. Example: If the directions say to use 2 gallons of chemical to every 100 gallons of water, but you plan to make up only 1 gallon, the chart below directs you to use 2 1/2 ounces of chemical to 1 gallon of water. 

Liquid Equivalent Table  


Solid Equivalent Table  


Soil Volume Equivalents  
Although soil volume is affected by the looseness of the soil mix, amount of packing and similar factors, the following information serves as a guide in soil preparation.  

Cubic Measure Linear Measure 16 ½ Feet or 660 Feet 5,280 Feet 
Dry Measure Square Measure 43,560 Square Feet 640 Acres = 1 Square Mile 
Volume Liquid Measure
*Level Spoonfuls 
Measuring Tables for Mixing Pesticide or
Foliar Spray The following table can be used to mix different amounts of a spray of the same mixture when using wettable powers. Example: If the label specifies that 3 lbs. of a wettable powder pestidie material are to be added to 100 gallons of water, then 1.5 T. of the pesticide material would make 1 gallon of similar spray mixture.
(The above measurements of WP are acceptable for practical purposes.) Tablespoon measurements will vary depending on the weight of the soluble powder. Tablespoons are really not intended for weight measurements and are offered solely as a convenience to the user. Different amounts of similar spray can be made from the following table, when liquid pesticide material (emulsifiable concentrates or EC) are used. When reducing the amount of spray mixture, be sure to stay in the right column and line as indicated above.
The above tables are strictly based on information that should be found on the label of the particular pesticide that will be used. For amounts of spray not listed, the tables above can be halved, doubled or by adding combinations as needed. Key for teaspoons and tablespoons:

Calibrating Pesticide &
Foliar Feed Equipment The first step in calibrating spraying, dusting or granulating equipment is to read the entire label of the pesticide you are about to use. Then decide on the dosage listed on the label that fits the needs for controlling that particular pest. Next follow this check list: 1. Select nozzles to provide
the proper application rate within the recommended range of pressures. Calibration of Hand Sprayers (Single Nozzle).
Example: To determine rate for wettable powder in hand sprayer when using package directions that call for making large amounts of diluted finish spray note this example. If the package says to add 2 pounds of soluble concentrate to 55 gallons of water and your back pack sprayer holds only 3 gallons of water, you must first convert the pounds to ounces. In this case 2 pounds = 32 dry ounces. Multiply the 32 ounces by the capacity of the back pack sprayer, which in this case is 3 gallons. Next, multiply that answer by the 55 gallons and you will have your ounces in dry ounces. 32 times 3 divided by 55 = 1.745 ounces of dry concentrate needed for the three gallon sprayer. 2 lbs x 55
gallons
x 3
gallon sprayer

Problem solving: Percentage Active Ingredient  
1. To determine the percentage of active ingredient in a
spray mixture: Formula:
(lbs. insecticide used) x (% active ingredient) Example: Eight pounds of Captan 50 percent wettable powder were mixed in 100 gallons of water. What percentage of Captan did the finished spray contain?
8 x 50 =
0.48% Captan
2. To determine the pounds of wettable powder needed to mix a spray contain a given percentage of active ingredients: Formula: (gallons of
spray wanted) x (% active ingredient wanted) x (8.3 lbs.) Example: Start with the gallons of finished diluted spray you wish to make and multiply it by the percentage of active ingredient you wish the finished spray to have. Take that number and multiply it by the weight of 1 gallon of water (8.3 lbs.), then divide that number by the percentage of active ingredient listed on the dry concentrate package. Example: How many pounds of Lindane 25 percent wettable powder are needed to make 100 gallons of spray containing 0.03 percent Lindane?
100 x 0.03 x 8.3 =
1.0 lb.
3. To determine the gallons of emulsifiable concentrate needed to mix a spray containing a given percentage of active ingredient: Formula: (gallons of
spray wanted) x (% active ingredient wanted) x (8.3 lbs) Example: How many gallons of 25 percent emulsifiable concentrate (2 pounds per gallon) are needed to make 100 gallons of spray containing 0.25 percent insecticide?
100 x 0.25 x 8.3
= 1.04 gallons
