Coverage · Source

University of Maryland — Texture × Province lime (SFM-5) + Maryland Nutrient Management Manual FIV-based N/P/K (combined source)

v2.2 (2026-08-23) · University of Maryland Cooperative Extension, November 2009. 'Agronomic Crop Nutrient Recommendations Based on Soil Tests and Yield Goals' I-B1, Maryland Nutrient Management Manual Supplement 6 (regulatory citation COMAR 15.20.08.05; published by Maryland Department of Agriculture). Lime: Steinhilber, P. (May 1997, still current), 'Soil pH Management and Determining Liming Rates' SFM-5. Lab method history: Maryland Cooperative Extension Soil Testing Laboratory used Mehlich-1 (double-acid) from 1954-2003; lab closed 2003. FIV scale uses lab-agnostic 100-point relative index (Steinhilber et al. SFM-4 'Converting among Soil Test Analyses Frequently Used in Maryland').

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

AlfalfaBluegrassBuckwheatCanolaCloverCornCorn silageCottonEastern Gamagrass and Improved Bermudagrasses (maintenance, 5 tons/A)FescueGrass / forageMilletOatsOrchardgrass And Reed Canary Grass (maintenance, 4 tons/A)PastureSmall grainsSorghumSoybeansSunflowerTimothy, Smooth Bromegrass, Perennial Ryegrass (maintenance, 3 tons/A)TobaccoWheat

Nutrient source for

MD

Lime / pH source for

MD

Frequently asked

What method does University of Maryland — Texture × Province lime (SFM-5) + Maryland Nutrient Management Manual FIV-based N/P/K (combined 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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