Irene Kightley wrote:
Who told him Permaculture was a "Supplemental agricultural practice" I wonder ?
The math is easy. With a polyculture, yields of 3-10 pounds of food per square foot are easy to come up with in most climates. For comparison, commercial agriculture in California , which is way inefficient, routinely runs about 1.5-2.5 pounds per square foot per year across a wide variety of crops.
Brenda Groth wrote:
and what if you import a few things..like salt and cinnamon that you can't get in Michigan naturally?
Here's an objection to permaculture I got just today after posting Toby's "Permaculture can save humanity" video on another forum:
"I think permaculture is really cool as a supplemental agricultural practice & also good for city/town planning & architectural design in general however, I've never heard of anyone ever feeding any significant number of people (even one) on this alone."
I've mentioned Sepp Holzer and the Bullock Brothers as examples of people who feed people by permaculture. If folks can give me some other successful examples of permaculture, that would be helpful.
Rebecca Hosking asks the question "Can permaculture feed Britain?" at 31:00 in her film "A Farm for the Future" - http://www.viddler.com/explore/PermaScience/videos/4/
Salatin's book "Salad Bar Beef" is very good - he has a number of very good techniques: using rotational grazing to rejuvenate pastures, following the cows with grazing birds to reduce flies and produce another crop, etc. etc. Very low in external inputs (a bit of seaweed, salt and some biological soap he uses as first defense against parasites), very much consistent with permaculture. And he provides enough beef, chicken, eggs and turkey to feed as many or more people as would come from using that land for a grain to cow operation.