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Delaware — UD Cooperative Extension Soil Testing Program (Mehlich-3 / UD-FIV)

v1.6 (2026-09-23) · UD Cooperative Extension Fact Sheet AGR-Grain-Corn 'Grain Corn — Nutrient Recommendations — Agronomic Crops' (last updated 2019-07-01). UD Soil Testing Program: 'Interpreting Soil Phosphorus and Potassium Tests' (https://www.udel.edu/academics/colleges/canr/cooperative-extension/fact-sheets/interpreting-soil-phosphorus-and-potassium-tests/). UD Nutrient Management for Corn in Delaware: The Pre-Sidedress Nitrate Test fact sheet. Adams-Evans buffer pH method for lime — see coastal_plain_adams_evans for the shared Coastal Plain lime source (verbatim DE-anchored 67% ECCE basis).

State extension method Computes rates in-app
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Crops covered

AlfalfaAlfalfa - New Seeding (UD ALS)Alfalfa/Grass Mixed - New Seeding (UD AGS)Annual or Italian Ryegrass - New Seeding (UD IRS)Annual or Italian Ryegrass Forage (UD ARF)Annual or Sweet Bromegrass Forage (UD ABF)BarleyBarley Forage (UD BAF)Bermudagrass - New Seeding (UD BGS)Big Bluestem - New Seeding (UD BBS)Brassica/Grass Mix - New Seeding (UD BGS)Cereal Rye Forage (UD RYF)Chicory/Grass Mix - New Seeding (UD CGS)CornCorn silageCorn Silage (UD CSI)Eastern Gamagrass - New Seeding (UD EGS)FescueForage Sorghum (UD FSF)Grass / forageGrass hayGrass/Legume Mix - New Seeding (UD GLS)Hemp and Kenaf for Fiber (UD HMF)Hemp and Kenaf for Fiber (UD KNF)Hemp f or Seed (UD HMS)Hops (UD HOP)Indian Grass - New Seeding (UD IGS)Kentucky Bluegrass - New Seeding (UD KBS)Little Bluestem - New Seeding (UD LBS)Malting Barley (UD MLT)OatsOrchardgrass - New Seeding (UD ORS)PasturePearl Millet (UD PMF)Perennial Ryegrass - New Seeding (UD PRS)Red Clover - New Seeding (UD RCS)Reed Canarygrass - New Seeding (UD RGS)RyeSericea Lespedeza - New Seeding (UD SLS)Small Grain/Legume Forage (UD SLF)Smooth Bromegrass - New Seeding (UD SBS)SorghumSorghum silageSorghum Silage (UD SOG)Sorghum/Sudangrass Hybrid (UD SSF)SoybeansSpring Oats (UD SOF)Sudangrass (UD SGF)Sunflower (UD SFL)Switchgrass - New Seeding (UD SGS)Tall Fescue - New Seeding (UD TFS)Teff (UD TFF)Timothy - New Seeding (UD TMS)Triticale Forage (UD TRF)WheatWhite Clover - New Seeding (UD WCS)Wildlife Food Plots - Deer (UD WDR)Wildlife Food Plots - Game Birds (UD WGB)Wildlife Food Plots - Rabbits (UD WRB)Wildlife Food Plots - Turkey (UD WTR)Wildlife Food Plots - Waterfowl (UD WWF)Winter Oat Forage (UD WOF)Winter Wheat Forage (UD WWF)

Nutrient source for

DE

Frequently asked

What method does Delaware — UD Cooperative Extension Soil Testing Program (Mehlich-3 / UD-FIV) use?

State extension method. Zone Forge computes this source's supported nutrient rates in-app and cites the published method.

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Yes — Zone Forge's calculators are free and need no signup. This page shows the states and crops Delaware — UD Cooperative Extension Soil Testing Program (Mehlich-3 / UD-FIV) covers so you can verify the source behind your recommendation.

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