From: "Lawrence F. London, Jr." <venaurafarm@bellsouth.net>
To: permaculture <permaculture@lists.ibiblio.org>, Market Farming <marketfarming@lists.ibiblio.org>
Subject: [permaculture] Fwd: Re: [SANET-MG] What controls soil pH?
Date: Sat, 01 Jan 2011 14:52:55 -0500
-------- Original Message --------
Subject: Re: [SANET-MG] What controls soil pH?
Date: Sat, 1 Jan 2011 14:11:18 -0500
From: Joel Gruver <jgruv@HOTMAIL.COM>
To: SANET-MG@LISTS.IFAS.UFL.EDU
Hello folks,
it is widely recognized that some N fertilizers are acidifying and that
lime can be used to raise the pH of acid soils but the ecology of soil
acidity seems to be poorly understood by most agriculturalists.
Only in places
like Australia and Brazil where the soils tend to quite acidic but
liming is often not
cost effective does there seem to be a more ecological approach to
managing soil acidity.
The following article by 2 Australian authors (first link is for a PDF
and second is for a *.doc of the same document) provides a good
discussion of how the C and N cycles affect soil acidification.
In a nutshell, cropping systems accelerate soil acidification primarily
through "opening" C and N cycles that are much more closed in natural
ecosystems. Soil acidity can be managed without lime or with less lime
using strategies derived from an understanding of how acidity is
produced and consumed by C and N transformation processes.
Joel
Joel Gruver
School of Agriculture
Western Illinois University
jgruv@hotmail.com
[permaculture] Fwd: Re: [SANET-MG] What controls soil pH?,
Lawrence F. London, Jr., 01/01/2011