To finally answer the question of whether, or not, kelp meal inhibits the intake of phosphorus (p) and potassium (k), I went to the experts at Fertrell for advice. Let me say, that those guys are truly experts and have built their whole careers on fertilizers and soil amendments and animal nutrition.
Basically, there is no evidence that the introduction of kelp meal into your soil will inhibit the uptake of P and K. That being said, the question has arisen in the past and it is acknowledged that even if the kelp does inhibit P and K, it would only be for a very short time. It should also be recognized that the plants, at any given time, may not be putting out demand for the intake of P and K. So, if P and K were temporarily unavailable, it would not hinder the growth of the plant at all.
Generally speaking, kelp helps the intake of important nutrients and their availability simply by its rapid decomposition. The short of it is that this concern should not be an issue.
I hope this helps and please feel free to ask any other questions on the subject of soil and animal health. I will do what I can to help, and I will try to be a bit more timely. Thanks for you r patience.
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