Idaho's publication is mapped and cited, but its exact calculation method is still staged and is not live in Zone Forge yet. WSU FS398E p.3 does not establish this SMP calibration for Idaho. Use a laboratory lime recommendation for your field. For a rate today, use the recommendation on your current soil-lab report or ask your local Extension office.
WSU FS398E p.2 discusses modified Mehlich for northern Idaho; p.3 does not establish the stored SMP calibration for Idaho.
Published source: University of Idaho — Northern ID (dryland Palouse) + Southern ID (irrigated Snake River Plain) Fertilizer Guides
Not yet. The published source is mapped and cited, but the exact calculation is still staged. Use the lime recommendation on your current soil-lab report or contact local Extension for a rate today.
WSU FS398E p.3 does not establish this SMP calibration for Idaho. Use a laboratory lime recommendation for your field. Source: University of Idaho — Northern ID (dryland Palouse) + Southern ID (irrigated Snake River Plain) Fertilizer Guides.
Zone Forge has mapped Idaho's published lime source, while clearly labeling its calculation as coming soon. For current numbers, use your soil lab's recommendation or local Extension; you can still review soil-test fertilizer guidance and full variable-rate prescriptions. See the science →