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  • From: "Peg Cook" <pegcook AT northnet.org>
  • To: "market farming" <market-farming AT franklin.oit.unc.edu>
  • Subject: Re: S & pH
  • Date: Fri, 7 Apr 2000 19:19:20 -0400


Bill,
I always ran into this situation when I had my lawn and garden shop. There
were many times when folks had to use Sulfur on their lawns and topdressing
the Sulfur took longer to bring down the pH, especially at development sites
where there was a lot of clay.

Peg Cook
Cook's Consulting

pegcook AT northnet.org

----- Original Message -----
From: Bill Shoemaker <wshoemak AT inil.com>
To: market farming <market-farming AT franklin.oit.unc.edu>
Sent: Friday, April 07, 2000 4:39 PM
Subject: Re: S & pH


> There isn't a reference to depth so the standard assumption would be a
> plow layer depth of 6" to 8". The acidification process should be
relatively
> rapid in a high pH soil. However, it is a good point to incorporate it.
>
> Another 50 lb would certainly not be a bad idea if you're starting
above
> 7.0. Even if it took the pH below 6.5, it wouldn't be too low,
particularly
> in a regime that tends toward alkaline anyway.
>
> Bill Shoemaker
> Sr Research Specialist, Food Crops
> Univ of Illinois - St Charles Hort Research Center
>
> -----Original Message-----
> From: Peg Cook <pegcook AT northnet.org>
> To: market farming <market-farming AT franklin.oit.unc.edu>
> Date: Friday, April 07, 2000 2:52 PM
> Subject: Re: S & pH
>
>
> >Bill,
> >Does your reference say whether that recommendation is for incorporation
> >within a 6-inch profile? If it doesn't specify that, you may want to up
> the
> >rate by 50 lbs.
> >
> >Peg Cook, Agronomist
> >Cook's Consulting
> >
> >pegcook AT northnet.org
> >
> >----- Original Message -----
> >From: Bill Shoemaker <wshoemak AT inil.com>
> >To: market farming <market-farming AT franklin.oit.unc.edu>
> >Sent: Friday, April 07, 2000 3:12 PM
> >Subject: Re: S & pH
> >
> >
> >> To bring the pH of a sandy loam up from 6.0 to 6.5 requires
approximately
> >> 1400 lb/acre of common limestone (95% CaCO3). To acidify a similar soil
> >from
> >> 7.0 to 6.5 would only require about 100 lb/acre of elemental sulfur.
This
> >is
> >> referenced from Knott's Handbook for Vegetable Growers, third addition.
> >>
> >> -----Original Message-----
> >> From: Peter Worsley <pwors AT svn.net>
> >> To: market farming <market-farming AT franklin.oit.unc.edu>
> >> Date: Friday, April 07, 2000 1:26 PM
> >> Subject: Re: S & pH
> >>
> >>
> >> >Alan Brant wrote:
> >> >>
> >> >> Can somebody tell me what quantity of Sulfur is needed to
> >affect
> >> pH
> >> >> significantly? I know it would vary, but are we talking about
> >quantities
> >> >> akin to lime? Can we hear an example e.g. on a silt loam, to lower
pH
> >> >> from 6.5 to 6?
> >> >
> >> >I, too, am curious about this. I'd like to lower PH from 7.2 to 6.8 on
> >> >sandy silt loam, for mixed vegetable production, including potatoes.
> >> >Thanks- Peter
> >> >
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> >
> >
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