I have called my system "soil immunization".
A few other things I do is plant a mixture of several varieties and every
year we grow a portion of next years seed potatoes from real seed. Also,
everything is home produced. We found at an early stage that home grown
seed potatoes did about twice as well than bought in certified seed. So we
have not bought seed in for more than 10 years.
I have explained in another mail to Lawrence that we did more or less the
same for a few other crops. For instance sweet corn outside is not an easy
thing to grow here. Too cold and too wet usually. But for the last 15
years now we have grown sweet corn quite reliably, every time saving our
own seed until we had a variety that could survive and thrive here under
our specific conditions and without any chemicals.
john
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