Re: Phosphorus questions
iris@hort.net
  • Subject: Re: Phosphorus questions
  • From: &* S* <s*@molalla.net>
  • Date: Sat, 7 Apr 2012 19:02:29 -0800
Scarlett: Triple (treble) superphosphate formula is 0-45-0. It is used extensively throughout the farming industry. Superphosphate formula is 0-20-0 and is a mixture of gypsum and monobasic calcium phosphate resulting from the action of sulfuric acid on phosphate rock, used as a fertilizer. Gypsum is calcium sulfate and has one use in improving drainage in heavy clay soils.
Neither the monoammonium phosphate nor the monopotassium phosphate is treble superphosphate. Treble refers to the amount (parts per 100 or percentage of the whole) of phosphorus present in the product as compared to a standard. 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.
The triple phosphate is not in any way detrimental to earth worms. Singular phosphate products are worked into the soil prior to planting rather than applied to already growing plants. The point of making the phosphate soluble is so that it is readily absorbed by the plant roots, much the same way that foliar feeding is absorbed through the leaves. 

I hope this helps.

Dave Silverberg
----- Original Message ----- From: <SDAyres2@aol.com> 
To: <iris@hort.net>
Sent: Saturday, April 07, 2012 4:31 PM
Subject: Re: [iris] Phosphorus questions



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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