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| might be a bit hard to convey online, but will try. First, I used the ISU equation from their 1688 field fertility guide. They have a basic formula, and then I substituted a prompt for the situations that applied to the different fields that I was liming that year. So a prompt for the ECCE of the lime being applied, and a prompt for the depth of tillage, or no tillage. So these are on the first settings page when setting up the equation at the bottom.
ISU Equation
lb of CaCO3 to raise pH to 6.5 = [49886 - (7245 x Buffer pH)] x [Depth x 0.167]
what they don't publish in the formula, but is in the description text is that you then divide this formula by the ECCE value so it would be more like
[49886 - (7245 x Buffer pH)] x [Depth x 0.167] /ECCE
The Buffer pH would come from your Soil Sampling map in the tree, and the Depth and ECCE would be prompts I mentioned above
in SMS that looks like this:
Edited by nei 1/23/2023 16:00
 (Lime formula (full).png)
Attachments
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 Lime formula (full).png (18KB - 56 downloads)
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How to write a lime Prescription in SMS
