So you pulled some soil cores and now you have the results in your hand, now what? On your soil test results you will want to check out pH, potassium, and phosphorous levels across all soil textures. If you have a lighter textured soil, check for sulfur levels as well. Today we will focus on pH and potassium recommendations.

For pH, you will want to see a soil test result of 6.2 to 7.0. This range allows alfalfa to have high nodulation and is a range that many of the essential nutrients are readily available. With established alfalfa, adjusting pH is challenging and surface application of lime can affect the upper 2 to 3 inches of the soil profile. However, a pH issue in an established stand can cause decreased nodulation and may be a sign to renovate. Bottom line in alfalfa: it is best to be correct the pH issue at least 4 to 6 months before establishment. Correcting pH in established fields is very difficult and may be a signal to renovate.

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