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Re: Copper Culture-Biodynamic farming

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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