Coverage · Source

Oklahoma — OSU SWFAL (PSS-2225) combined lime + nutrient source

v2.1 (2026-06-10) · Zhang, H., Arnall, B., & Raun, B. (Oct 2017), 'OSU Soil Test Interpretations', PSS-2225, Oklahoma State University Extension — https://extension.okstate.edu/fact-sheets/osu-soil-test-interpretations.html (PDF: https://extension.okstate.edu/fact-sheets/print-publications/pss/osu-soil-test-interpretations-pss-2225.pdf). SUPPORTING: PSS-2229 'Soil pH and Buffer Index', PSS-2237 'Sulfur Requirements of Oklahoma Crops', PSS-2240 'Managing Acid Soils for Wheat Production', PSS-2266 'Fertilization Based on Sufficiency, Build-up and Maintenance Concept', E-1039 'Oklahoma Soil Fertility Handbook'.

State extension method Computes rates in-app Lime / pH
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Crops covered

AlfalfaBarleyBermudagrassBluegrassCanolaCornCorn silageCottonDry beansForage legumesGrass / forageGrass hayLovegrassPasturePeanutsSorghumSoybeansWheat

Nutrient source for

OK

Lime / pH source for

OK

Frequently asked

What method does Oklahoma — OSU SWFAL (PSS-2225) combined lime + nutrient source use?

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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