It's not considered a fertilizer per se, so that's why no NPK
breakdown. But most kelp extracts come out around 0-1-1 - pretty low
in the nutrient department. And since they are an organic source, it
is pretty hard to overdo with them. As stated, the big benefits are
the trace elments they provide. btw, the salts are natural salts, not
the nutrient salts of synthetic chemical fertilizers. And they do get
diluted, as well.
The origin of the salts is not important but the type, just because it is
"natural" doesn't mean it is necessarily benign. You don't want to be
adding sodium salts to your soil, seaweed products contain these to various
degrees as they are concentrated from seaweed which naturally contains such.
Full complement of secondaries and micronutrients, IIRC.
Lots of growth regulators, like giberellins (which are why
kelp grows so fast).
A good potassium source according to what I've read, which
is why I was curious about the NPK.
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