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Re: it's rooted, seaweed [kelp]

That's complete news to me, Kitty. They surely never mentioned that in the Master Gardener courses. So, how much phosphorus would you say ultimately is available? Margaret L

Guaranteed Analysis (GA) must list only what is IMMEDIATELY available. A
lot of natural fertilizers contain elements that need to be broken down
over time.  Consequently Kelp contains more nitrogen than the 1% shown,
just available a little later.  It also contains the phosphorous that
appears to be missing because it requires time and friendly organisms to
break it down before it becomes available.  It's all there, but the
government won't allow it to be listed in the GA.
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