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Calculating and Mixing Chemicals

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. First Things First.

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Calculating and Mixing Chemicals

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  1. 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

  2. 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

  3. Chemical Toxicity • Danger - Highly Toxic • Warning - Moderately Toxic • Caution - Slightly Toxic • (Nothing) - Relatively Non-Toxic

  4. 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.

  5. 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

  6. 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

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