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RE: [compost_tea] triple superphosphate and roses



Chris-
 
The main detriment is to soil chemistry, which eventual impacts soil biology. 
 
Triple super phosphate, 0-46-0, is made by treating rock phosphate with phosphoric acid, and this highly acidulated form becomes complexed or tied up rapidly in most soils.  Super phosphate can tie up zinc, iron, and manganese.  Below about pH 6 phosphorus can become complexed with aluminum, and above pH 7 calcium.  This is why a good organic system is critical...it acts as a buffer, but also provides the necessary microbes (mycorrhizae) to make this recalcitrant element plant available.
 
Soft rock phosphate is the choice of most organic gardeners.  The ammoniated phosphates (MAP [preferable], DAP) are easy on soil biology and have good energy.
 
Tim Kiphart
 
 
 
 -----Original Message-----
From: chris reid [mailto:reidchris@earthlink.net]
Sent: Thursday, July 24, 2003 9:03 AM
To: compost_tea@yahoogroups.com
Subject: [compost_tea] triple superphosphate and roses


In looking at Rose Tone fertilizer (Espoma) product label, I see 6 per cent
available phosphorus in the form of P2-05, and in the ingredients, triple
super phosphate is listed.
http://www.espoma.com/default.asp?strPage=productinfo&intCategoryID=4&id=26

If triple super phosphate is supposed to harm soil biology, then this
organic rose fertilizer may not be the best thing to use in conjunction with
efforts to build a balanced soil.  Hmmm.

Sounds like I need to look for something else to use.  What exactly is the
effect of this type of phosphorus on the soil and what type of phosphorus is
okay to use?


thanks,

Chris Reid



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