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N FLA | Doesn't make sense you are at 6-8% K sat. I've not heard of levels that high, so kind of a red flag, but just don't know about your soils? And I think 1% is very low for tissue. I don't know, but beans need potash and i wonder if it's tied up on the stiff dirt. We always say beans like stiffer dirt, compared to our sand that has cec of 4 or so. Not entirely different than you are referring to. Maybe a water table in the root zone?
Hmm, poor nodulation. Often a weakness on our sand. Try a fresh liquid inoculant in furrow. Maybe organic fertilizer if possible. Chicken, cow etc. Good K sources.
I've never dealt with it, but isn't there alot of talk about molybdenum deficienct soils and poor nodulation? It used to be popular here to treat seed with moly, thats just hearsay though, no personal experience.
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Soya bean yield mystery.
