Re: chemical assist

---

• To: d*@leland.stanford.edu
• Subject: Re: chemical assist
• From: P*@aol.com
• Date: Tue, 26 Aug 1997 22:43:38 -0400 (EDT)

In a message dated 97-08-26 03:55:10 EDT, you write:

<<  assist
 Date:	97-08-26 03:55:10 EDT
 From:	dgs@leland.stanford.edu (Dan Shapiro)
 To:	Pumkinguy@aol.com
 
 Do you know if  greenhouse growers have to amend their soil to keep the
 acidity down?  I'm told CO2 reacts with materials in soil to increase
 acidity.
 	Dan
 
 >Dan,
 >   Sometimes CO2 levels are depleted in a greenhouse ( especially in the
cold
 >months when the house is closed). Some greenhouses imploy CO2 generators to
 >keep levels up. If levels fall to 100 or 200 PPM growth will be inhibited.
 >                                             pumkinguy@aol.com
 
 
 
 
 
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 Date: Mon, 25 Aug 1997 11:46:16 -0800
 To: Pumkinguy@aol.com
 From: Dan Shapiro <dgs@leland.stanford.edu>
 Subject: Re: chemical assist
  >>
Dan,
   It is true that co2 can acidify soil, but I don't think it will be
significant. Let me dig back in my memory...........CO2 + H20 = H2CO3
(carbonic acid)  When water percolates through the soil filled with CO2,
carbonic acid forms. This is what dissolves limestone caves over the years.
Carbonic acid is very weak and the small amount that developes would probably
not be as acidic as the acidifying effect you get from the fertilizers you
put on. In other words I wouldn't worry about it. In a highly organic soil
with aerobic conditions, you will be generating lots of CO2. I would bet that
a rapidly composting soil would have CO2 levels much higher than the air
(330ppm). If pH is low a little limestone will counteract the carbonic acid,
acid rain and the fertilizers.
                                        pumkinguy@aol.com

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