Soil Test Results - Now What?

Lawn I assume? It’s a fertile alluvial soil, typical of much south LA. pH would be higher than optimal for centipede, but fine for St Aug, bermudagrass & zoysia.

You should get a follow up communication from the AgCenter providing soil amendment and fertilizations recommendation for whatever lawn grass type you specified. Interpretation of those recommendations is often confusing for the homeowner as they written for the farming community, but you can always bump the thread if you need any assistance interpreting the recommendations.

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Does “excessive” for sodium mean it’s higher than very high? If it needs to be “flushed” from the soil, wouldn’t gypsum application be the answer? Although, you might by

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I've never seen a AgCenter Center soil report with "excessive" listed, and I've seen many, and I assume its higher than "very high". High sodium clay minerals would only be prevalent in the near coastal zone, or inland in deep marine geological deposits that was once the sea coast - Baton Rouge geological aquifers come to mind. Could be a soil sample was taken where someone dropped pool salt, drilling mud, etc at an earlier time. Not sure it would be an issue anyway - I would need to check the literature. But when some parameter is really out of the general norm, its usually best to take another sample and have it re-analyzed.

But you are correct - calcium compounds such as gypsum (calcium sulfate) are used to "bump/replace" sodium ions attached to clay particles, where calcium replaces the sodium on the clay mineral, sodium moves into soil pore water where it can be flushed, along with the sulfate, from the soil pore water via water irrigation. High levels of calcium would be less deleterious to plants than sodium.

OP should not do anything until he obtains additional info from the AgCenter which he should be receiving.

Did they give CEC and Base Saturation %