Lime Requirement Calculator

This Lime Requirement Calculator is an Excel (.xlsx) file. It is not accessible via assistive technologies. For assistance using this tool, please contact WSU regional Extension agronomist Rachel Wieme at rachel.wieme@wsu.edu.

Lime Requirement Estimate Calculator: Instructions for use

Please refer to Determining Lime Requirement Estimates for the inland Northwest: A guide to the updated Lime Requirement Calculator for the detailed explanation of the calculations contained in this tool.

How this spreadsheet works: Each tab of this spreadsheet (located at the bottom of the page) contains a different method for obtaining a lime requirement. Use the tab that corresponds with the method that is recommended for your soils (based on Antonangelo, et al. (under review)) or the buffer test performed by your soil testing laboratory. If you need a recommendation prior to publication of the user guide, please contact rachel.wieme@wsu.edu.

Yellow cells are cells where you will enter values from your soil test report; green cells are where results will populate once the necessary inputs have been entered. Instructions for entering values from soil tests and assumptions of the calculations are located below each calculator.

Lime Requirement Estimates in this calculator assume 100% effective calcium carbonate equivalents (ECCE). Use the calculator in the “Conversion” tab to convert to the amount of actual product required. You may also adjust other soil properties (sample depth, bulk density) if they do not match the assumptions of the LRE calculator.

Authors: Joao Antonangelo, Carol McFarland, Rachel Wieme (2024)