• Subject: Re: Phosphorus questions
• From: S*@aol.com
• Date: Mon, 9 Apr 2012 11:36:33 -0400 (EDT)

Dave:

I looked up EDTA.  What a mouthful!  Wikipedia states that after  being
bound by EDTA, metal ions remain in solution but exhibit diminished
reactivity.  So I guess it holds the zinc, manganese, and iron in solution
preventing
them from forming say iron phosphate.  I guess the plant can  pull out the
zinc, iron and manganese from the solution gradually over  time?

Here is the paragraph that I am going to include in my article for the
newsletter.  Is it correct?

"
People found early on that superphosphates and especially treble
superphosphate quickly bound zinc, iron and manganese so that the plants
canbt
assimilate them. Most fertilizer companies now include these minerals in their
products.   Note that the clubbs favorite fertilizer BR-61 contains  .12%
iron, .05% manganese and .05% zinc.  The EDTA and DPTA (a type of acid  whose
name is too long to type correctly) are used to hold the iron, manganese  and
zinc in solution so as not to cause any unneeded interference with the
phosphorus (phosphate) absorption.
"

Scarlett




In a message dated 4/7/2012 8:07:07 P.M. Mountain Daylight Time,
sil1812@molalla.net writes:

The EDTA  and DPTA are used to hold the iron, manganese and zinc in
solution
so as  not to cause any unneeded interference with the phosphorus
(phosphate)
absorption.

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