Arkansas's land-grant extension publishes a method — not a one-size-fits-all rate. UA soil pH + soil-test Ca lookup (no buffer). CROP-SPECIFIC published lime tables (method ar_crop_lime_tables): soybean (MP197 Ch5 Table 5-3) & rice (MP192 Ch9 Table 9-24) = texture(Ca)×pH → lb ag lime; corn (MP437) & grain sorghum (MP297) default to the conservative rice-rotation pH-only tables; cotton = UA general pH×Ca table. Cells are ag lime (~54% ECCE); engine returns CaCO3-eq ×0.54. Wheat/alfalfa have no published UA crop lime table → they fail closed. (Corrected 2026-08-13: the earlier 'FSA2153/turf-only, cropland pending' note was wrong — FSA2153 is a report-reading explainer; the real cropland tables live in the crop handbooks.) Live calculator uses this state's published method and citation. Enter the required soil-test values in the free calculator for tons of CaCO₃-equivalent per acre, ECCE-adjusted, with the citation.
Published source: University of Arkansas — pH+Ca lime + Mehlich-3 nutrient recs
It depends on the inputs Arkansas's land-grant method publishes — not a single national number. UA soil pH + soil-test Ca lookup (no buffer). CROP-SPECIFIC published lime tables (method ar_crop_lime_tables): soybean (MP197 Ch5 Table 5-3) & rice (MP192 Ch9 Table 9-24) = texture(Ca)×pH → lb ag lime; corn (MP437) & grain sorghum (MP297) default to the conservative rice-rotation pH-only tables; cotton = UA general pH×Ca table. Cells are ag lime (~54% ECCE); engine returns CaCO3-eq ×0.54. Wheat/alfalfa have no published UA crop lime table → they fail closed. (Corrected 2026-08-13: the earlier 'FSA2153/turf-only, cropland pending' note was wrong — FSA2153 is a report-reading explainer; the real cropland tables live in the crop handbooks.) Enter your values in the free Zone Forge lime calculator for tons of CaCO3-equivalent per acre, with the citation.
UA soil pH + soil-test Ca lookup (no buffer). CROP-SPECIFIC published lime tables (method ar_crop_lime_tables): soybean (MP197 Ch5 Table 5-3) & rice (MP192 Ch9 Table 9-24) = texture(Ca)×pH → lb ag lime; corn (MP437) & grain sorghum (MP297) default to the conservative rice-rotation pH-only tables; cotton = UA general pH×Ca table. Cells are ag lime (~54% ECCE); engine returns CaCO3-eq ×0.54. Wheat/alfalfa have no published UA crop lime table → they fail closed. (Corrected 2026-08-13: the earlier 'FSA2153/turf-only, cropland pending' note was wrong — FSA2153 is a report-reading explainer; the real cropland tables live in the crop handbooks.) Source: see the calculator citation. Source: University of Arkansas — pH+Ca lime + Mehlich-3 nutrient recs.
Zone Forge computes Arkansas lime from that state's published land-grant method (the lab values required by this state's published method) — lime calculator, soil-test fertilizer, and full variable-rate prescriptions. See the science →