Re: Copper Culture-Biodynamic farming

**"* S* <m*@gmail.com>**

Kathryn: I suspect he made a wise investment....

Miranda

On Sun, Apr 20, 2008 at 9:28 AM, Kathryn Marsh <kmarsh@iol.ie> wrote:

> A Smith period is one in which there is 90% humidity for an 11 period
> in each of two successive days and the minimum air temperature for
> the 48 hour period is 10C - the growing conditions for late blight.
> Named after LP Smith, for many years head of the agricultural section
> of the British Met Office.  A very encouraging man who paid a teenage
> weekend garden assistant for his holiday home a lot more than she was
> worth.
>
> In the light of current food security problems his 1984 "Fight for
> Food"  and other publications on weather and food written for the FAO
> as early as the 60s are well worth revisiting
>
> Kathryn
>
>
>
> On 20 Apr 2008, at 12:23, margaret lauterbach wrote:
>
> > Kathryn, what is a "Smith period"?  I've not seen silica available as
> > a spray in Idaho, AFAIK.  Does it masquerade under another name in
> > America?  Margaret L
> >
> >
> > At 03:39 AM 4/20/2008, you wrote:
> >> I've found silica as effective as copper sulphate against late blight
> >> on potatoes so long as I spray early enough - if I wait for a Smith
> >> period  then its has to be the copper
> >>
> >> kathryn
> >
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