There are three analyses performed on agricultural liming materials (ALM) to determine the Effective Neutralizing Power (ENP) and minimum pounds of ENP per ton. These analyses are (a) Chemical purity or Calcium Carbonate Equivalent (CCE); (b) Fineness or Fineness Index (FI); and (c) Moisture Content.
Lastly, ENP is determined by multiplying the CCE by FI. By multiplying the percent ENP by 2,000 pounds and by the ALM's percent dry matter, the minimum pounds of ENP per ton is determined. Minimum pounds ENP per ton equals the pounds of pure calcium carbonate that is considered to be available over a three-year period per ton of the analyzed ALM.The pounds of ENP per ton is required information on the ALM label. The minimum pounds of ENP per ton ALM quality rating listed on an official ALM analysis report is the highest number that an ALM producer, distributor, or dealer can use on a label. The producer, distributor, or dealer may list a lower quality rating on a label to compensate for possible quarry or stockpile variations.
Assumed % Moisture = 5% = 95% Dry Matter && Assumed CCE Analysis = 90%
Fineness Index Analysis Calculations
U.S. Sieve Size
% Passing Sieve Sizes
Difference % Passing 8-20 OR 20-60 Mesh Sieve
= Fineness Index
Per Sieve Size
93 - 70 = 23
70 - 46 = 24
46 - 00 = 46
Fineness Index (FI) = 65.0
% CCE (90) X FI (65) ¸ 100 = % ENP (58.5%)
2,000 lbs. ALM/Ton at 5% moisture X (% ENP ÷ 100) X (% DRY MATTER ÷ 100) = 1,112 Min.
lbs. of ENP per ton (.585) (.95) corrected for moisture
A ton of ALM is priced at $15.00 per ton, the resulting price per pound of ENP is $0.0135 or 1.35 cents. $15.00 1,112 minimum lbs. ENP per ton = $0.0135 or 1.35 cents per lbs ENP.
Ed Kaiser, ConsultantEd.Kaiser@state.mn.us651-201-6275Pesticide & Fertilizer Management Division