Calculate Lime Application

This form’s target pH = 6.5. Please check our pH Ranges for Plants to see if 6.5 pH is outside of the appropriate range.
Note: Limit lime application to no more than 2.5 tons/acre/application. Maximum two applications/year if done spring and fall.
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If using a University of Vermont soil test where none of the values needed above are given, Use the form below to determine your CEC, acidity, and a lime application rate (tons/acre) based on calculated values. NOTE: It’s unlikely that the lime application rate suggested in this form will match UVM’s recommendation which is based on reactive aluminum (Al). Click To view UVM’s Lime Application Rate Table.

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What type of lime should you use? First, determine your calcium:magnesium ratio

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Use calcitic lime if the Ca:Mg ratio is below 7:1
Use dolomitic lime if the Ca:Mg ratio is above 10:1

If the Ca:Mg ratio is in between 7 and 10, look at the base saturation of Mg and Ca. If Ca saturation is below 65%, use calcitic lime. If Mg saturation is below 10 %, use dolomitic lime. If both are above or both are below these minimums, use calcitic lime. Most calcium lime in the Northeast contains 3-5 percent Mg so some Mg is usually being applied.