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Old Mister Crow
Join Date: May-2002
Location: Seattle, WA.
Country: USA
Posts: 3,197
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The honest answer is something along the likes of
"The heck if I know."
The more speculative albeit more detailed answer would be
DynaGro is claimed to be better than MiracleGro because the various nutrients are in forms that can be more easily and better metabolised by the plant. Whatever that means. What I do know is that the nitrogen can be in chemical different forms and different sorts of plants do better with different types. I don't have any hard data on this.
Supposedly the advantage of the fish sauce (as I call it) is that as an organic, it promotes the growth of beneficial microbial organisms in the soil and the likes. And, it smells so damn awful that it's got to be good. As for alternating, why not? That's what I do. Right now I'm alternating between full-strength fish sauce one week and full-strength DynaGro the next. But I really can't say from first hand observation whether this is better than any other approach. What I can say is that it's a lot better than not fertilizing at all.
Hopefully some of those more knowledgable horticulturalists who I know read this board will chime in here.
All the best,
OMC
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In love with trees
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