Re: Phosphorus questions
iris@hort.net
  • Subject: Re: Phosphorus questions
  • From: S*@aol.com
  • Date: Sat, 7 Apr 2012 20:31:14 -0400 (EDT)
Dave:
 
I did google it.  I am unclear whether Monoammonium Phosphate is  
superphosphate or treble super phosphate. Some sources said to beware of treble  
superphosphate.  Note that they added Iron, manganese and zinc because of  the 
antagonism of these elements with phosphorus.
 
 
 
Scarlett
 
 
In a message dated 4/7/2012 5:42:03 P.M. Mountain Daylight Time,  
sil1812@molalla.net writes:

Scarlett: The formula is 9-58-8 and the source of the potassium is  
<<Derived 
from Monoammonium Phosphate, Monopotassium Phosphate, Iron  DPTA, Manganese 
EDTA, Zinc EDTA>>. Suggest you Google BR-61  formula.

Dave Silverberg


----- Original Message -----  
From: <SDAyres2@aol.com>
To: <iris@hort.net>
Sent:  Saturday, April 07, 2012 2:25 PM
Subject: [iris] Phosphorus  questions


> Hi All:
>
> I am writing a newsletter  for the  club.  I have been reading about
> superphosphates on  the web and am  confused.
>
> 1.  Is treble  superphosphate  harmful to earthworms?
>
> 2.  Some  websites suggest  that treble superphosphate has to be carefully
>  measured to avoid burning the  plants.   Though other  websites  state 
that
> salt index is the usual measure of a  fertilizer's tendency to burn  
roots.
> According to these sources,  triple superphosphate has an exceptionally 
> low
> salt index and  is very unlikely to harm roots.   Who do you  believe?
>
> 3.  Rock phosphate is very insoluble.   It will stay where you put it
> unless the soil washes  away.   However, Superphosphate  is rock 
phosphate 
>  that
> has been treated with acid to make it soluble.  Does   that mean it can be
> washed away from the point of application?   How long  before it gets 
> converted
> to the regular rock  phosphate?  Or does it too  combine quickly with just
> about  any available mineral in the soil (i.e. iron,  zinc,  manganese)?
>
> 4.   Does anyone know what type of  phosphate BR-61 contains?   It's  the
> club's favorite  and high in the middle number.  We buy it in bulk and 
>  parse
> it out to members.  Instead of being $9 a lb it comes out  to $3 a  lb.
> However, I have no container to   read.
>
> Thanks  a bunch
>
>  Scarlett
>
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