Exactly Paul, so why are they making the fertilizers with almost reverse proportions Fe:Zn:Mn?
I have been using Kelp rather extensively but the effect came with the mancozeb. One disclaimer though, it may also come from copper, I add some copper-oxychloride to the mix. I do spray on dendrobiums as well, have not seen any negative effects on them but I use hard water for mixing the spray. For reference; Xaviers anecdotes particularly abour Vacherot et Lecoufle.
I have been using Kelp rather extensively but the effect came with the mancozeb. One disclaimer though, it may also come from copper, I add some copper-oxychloride to the mix. I do spray on dendrobiums as well, have not seen any negative effects on them but I use hard water for mixing the spray. For reference; Xaviers anecdotes particularly abour Vacherot et Lecoufle.