Calculating and Mixing Chemicals

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Calculating and Mixing Chemicals

• Prepared by Mr. Eddie McKie
• South Region Area Horticulture Teacher
• Georgia Department of Education
• For the Georgia Agricultural Education
• Curriculum Office
• May 2002

Modified by the GA Agriculture Education
Curriculum Office July 2002
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First Things First

• Think Safety
• Read Label Directions
• Wear Protective Clothing
• -Long Pants
  -Respirator
• -Long Sleeves -Eye
  Protection
• -Fully Enclosed Shoes
  -Preferably Chemical
• -Chemical Resistant Gloves Resistant
  Coveralls or
• 
  Apron

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Chemical Toxicity

• Danger - Highly Toxic
• Warning - Moderately Toxic
• Caution - Slightly Toxic
• (Nothing) - Relatively Non-Toxic

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Toxicity

• Expressed by LD50. The amount of ingredient per
  kg body weight that will kill 50 of the test
  population.
• Test population is usually rats.

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• Farmer Jones wants to apply Roundup around his
  pecan trees. Roundup is to be applied at the rate
  of 1.5 lbs a.i. per acre. If the Roundup is sold
  in a container that is 3.6 lbs. a.i. per gallon,
  how many pints will he need to apply/acre?
• conc. per acre(pints) lbs a.i.
  desired X 8
• 
  lbs. a.i. per gallon of liq.
• conc.
• X 1.5 x 8 10 2.78
  pints
• 3.6 3.6

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• How many ounces would this be?
• conc. per acre(ounces) lbs a.i.
  desired X 128
• 
  lbs. a.i. per gallon of liq.
  conc.
• X 1.5 x 128 192 197.78
  ounces
• 3.6
  3.6
• How many quarts would this be?
• conc. per acre(quarts) lbs a.i.
  desired X 4
• 
  lbs. a.i. per gallon of liq. conc.
• X 1.5 x 4 6 1.67
  quarts
• 3.6 3.6