I like the down to earth products, it's organic and a very fair price at my shop and they make 25 & 50 lb bags too
Maxicrop do a powdered seaweed meal...
In terms of elements there is very little difference. Some old timers call alfalfa 'field kelp' - where the huge differences come into play are in the compounds (Secondary Metabolites) that all plants produce. In the case of brown kelp meal there is one compound, specifically, (Alginic acid) that is unique to that species, i.e. it does not exist in green or red kelp (marine algae). Kelp produces over 380 compounds.
Alfalfa also produces compounds that are equally important and completely different in function and benefit. This plant brings over 340 compounds to the party. Both plant materials are the rawest that you can source - minimum processing resulting in more compounds remaining intact and available.
BTW: you don't want to use cottonseed meal irrespective of any 'pH issues' - it's one of the most heavily sprayed crops in the USA. It's pure garbage.
CC
Cal-Sea-Feed is calcified seaweed (powdered)...with that and dolomite lime I'm hoping to have the cal/mag sorted.../QUOTE]
They still make that stuff? Are you in the UK?
You're doing way to much bro. Go with what burnone said....Very simple
OP