The formula for calculating the Effective Calcium Carbonate Equivalent (ECCE) for agricultural limestone is:

ECCE = Calcium Carbonate Equivalent (CCE) x Fineness Factor.

CCE is determined in a laboratory (acid neutralizing factor)

Fineness Factor (Iowa Limestone Law) is calculated from (data for other sieve sizes are not used):

      _______  % material passing a 4-mesh screen             x 0.1         = _________

+   _______   % material passing an 8-mesh screen          x 0.3         = _________

+   _______   % material passing a 60-mesh screen          x 0.6         = _________

                                          TOTAL Fineness Factor                       = _________ 

1. You have a liming material with a CCE of 80%. 100% of it passed a 4-mesh screen, 80% passed an 8-mesh screen, and 70% passed a 60-mesh screen. What is the fineness factor? (NOTE: information for other screen sizes is not used according to Iowa Limestone Law so it should be ignored.)
What is the ECCE?

How much of this material would you need to apply to supply 2500 lbs of ECCE/ac?

2. How much pure CaCO₃ would you apply to a kilogram of soil in a flower pot to neutralize 2 meq acidity/100 g of soil?
(Atomic wts: Ca = 40, C = 12, O = 16, H = 1)

3. How much CaO would you apply to the soil in question 2?

4. How much Ca(OH)₂ would you apply to an acre-6" of the soil in question 2?

5. What is the % CCE of Ca(OH)₂?

6. Your soil test report calls for 1900 lbs of ECCE per acre for a 6-inch depth but you wish to incorporate the lime to an 8-inch depth. How much lime is required?

7. Your local quarry has a liming material that is 87% ECCE and costs $13.00/ton ECCE delivered and spread on your field. Your soil test report calls for 3400 lbs/ac of ECCE. a) If you are applying lime to 20 acres, how much should you pay for the lime? b) How many tons of limestone must the quarry deliver to your field to meet this requirement?

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