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TreeZoo - thank you for the link. At first, I was a little freaked out by the error message ("An Error Occurred...") but the link is valid. I read not only the abstract but the PDF file ( An Error Occurred Setting Your User Cookie ). However, they discuss "Manganese Binding by Municipal Waste Composts Used as Potting Media" ("ornamental plants in container media"). Note that they didn't use Milorganite, but "composted sludge" from Broward County FL.
Here's Milorganite's link for fertilizing palm trees:
Interestingly (for me in terms of this discussion), Milorganite links to the U of F (which references the study to which you linked for their conclusions regarding Manganese):
I did not spend a lot of time researching Broschatt's published work on the subject but I assume there is more out there. In dozens of classes, lectures, seminars and personal conversations with him, I can assure you that his warning relates to ALL sludge products as well as cattle and horse manure. Milorganite was top of his list as to what to avoid in palm ferts.
One more time... in spring using it to avoid burn is a maybe.
In the fall? use organic (manure) etc)
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