Louisiana · Soil test

Louisiana soil-test fertilizer recommendations

Zone Forge reads your Louisiana soil test in Louisiana's own calibrated language — the critical levels and rate logic come straight from LSU AgCenter Soil Testing & Plant Analysis Lab — combined lime + N/P/K/S nutrient source, not a national average. Lime has its own live calculator for Louisiana with method-specific lab inputs.

See Louisiana recommendations → Louisiana lime guide

Crops covered

LSU AgCenter Soil Testing & Plant Analysis Lab — combined lime + N/P/K/S nutrient source rates these crops in Louisiana:

AlfalfaBermudagrassBrassicasBrassicas — alluvial soilsBrassicas — upland soilsCloverCornCorn silageCottonFescueGrass hayMilletOatsOats, rye, ryegrass, ryegrass-clover mix, tall fescue, tall fescue-clover mix, wheat — alluvial soilsOats, rye, ryegrass, ryegrass-clover mix, tall fescue, tall fescue-clover mix, wheat — upland soilsPastureRiceRyeSorghumSorghum silageSoybeansSugarcaneWheat

Published source: LSU AgCenter Soil Testing & Plant Analysis Lab — combined lime + N/P/K/S nutrient source

Frequently asked

What soil-test method does Louisiana use?

LSU AgCenter Soil Testing & Plant Analysis Lab — combined lime + N/P/K/S nutrient source. Zone Forge cites the publication on every recommendation.

Is the Louisiana soil-test calculator free?

Yes — the Louisiana soil-test recommendation calculator is free and needs no signup. Enter your lab values for source-cited P and K; Louisiana's live lime calculator is available separately with its own required lab inputs.

Can Zone Forge calculate a Louisiana lime rate?

Yes — the free soil-test calculator covers source-cited P and K. Louisiana also has a live lime calculator on Zone Forge that uses the state's published method. Open the Louisiana lime guide or lime calculator for tons of CaCO3-equivalent per acre.

Zone Forge reads every Louisiana soil test in its own state's language, then builds source-cited fertilizer and a live lime calculator and full variable-rate prescriptions. See the science →