v2.1 (2026-06-10) · LIME: Ketterings, Q.M., Reid, S., & Czymmek, K.J. (2023 update), 'Lime Guidelines for Field Crops in New York', Cornell University NMSP — http://nmsp.cals.cornell.edu/publications/extension/LimeDoc2023.pdf, plus Cornell Fact Sheet #48 (http://nmsp.cals.cornell.edu/publications/factsheets/factsheet48.pdf). PHOSPHORUS: Ketterings, Q.M. & Workman, K.C. (July 20, 2022), 'Phosphorus Guidelines for Field Crops in New York' — http://nmsp.cals.cornell.edu/publications/extension/Pdoc2022.pdf. POTASSIUM: Ketterings, Q.M. & Workman, K.C. (April 11, 2024), 'Potassium Guidelines for Field Crops in New York' — http://nmsp.cals.cornell.edu/publications/extension/Kdoc2024.pdf. NITROGEN: Ketterings, Q.M. & Workman, K.C. (May 17, 2023, version 1 July 12, 2022), 'Nitrogen Guidelines for Field Crops in New York. Second Edition' — http://nmsp.cals.cornell.edu/publications/extension/Ndoc2023.pdf. CONVERSIONS: Ketterings, Q.M., Czymmek, K.J., Reid, W.S., & Wildman, R.F. (2002), 'Conversion of modified Morgan and Mehlich-III soil tests to Morgan soil test values', Soil Science 167(12): 830-837.
State extension method. Zone Forge computes this source's supported nutrient rates in-app and cites the published method. Its published lime method is computed in-app too.
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