#1




Lime application formula
I was provided with a link to this article by heritage:
What caught my eye was the lime application formula which is: tons CaCO3 / acre = Ac [(desired pH  soil pH) / (6.6  soil pH)] What that means is if the soil is 6.6 you apply infinite lime. If the soil pH is 6.5 you apply twice as much as if it was 6.4... This formula screams inaccuracy and I was curious if anybody could help with some direction given soil acidity, pH, etc. 
#2




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#3




In other words the formula can be simplified to:
tons CaCO3 / acre = Ac Lol. 
#4




You have misunderstood and misrepresented the formula, which is the reason for your confusion.

#5




According to the formula the bracket portion will not differ greatly from the number 1 because 6.6 happens to be an ideal soil pH. If 6.6 is taken as an ideal pH level then the bracket portion is equal to 1. My confusion lies in the simplicity of the formula and questions its' accuracy. I was merely pointing out that if the target pH varies greatly from 6.6 then the formula makes little logical sense as a way of providing one reason why I distrust this formula. I am asking if this is the standard formula or what others use, although I understand that formulas vary greatly from place to place.

#6




From your link.
http://www.soil.ncsu.edu/about/century/soilacidity.html The procedure for measuring exchangeable Al+3 is not well suited for routine soil testing procedure. For this reason a buffer solution pH 6.6 is used to measure extractable acidity (Ac) in North Carolina soils. The buffered solution extracts both exchangeable Al3+ and the pH dependent acidity (H+) which becomes ionized up to pH 6.6. The lime rate to apply is calculated with the following equation.Furthermore, without a value for Ac the formula is worthless. 
#7




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