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Use of Biological resources- organic vs chemical model

Douglas Crouch
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In this article I write on the Permaculture Design principle that Bill Mollison wrote in his book Introduction to Permaculture. It gives context and graphics to show the difference between relying on biological resources or chemical resources to grow food and fulfill ecological functions. This article frames many design elements and also management strategies and techniques. Here is the article from my TreeYo EDU project, a PDC handbook:

excerpt summary:
Using Biological Resources: Is the key strategy to develop sustainable systems, save energy and do the work of the farm. Their building up on location is a long-term investment, they have to be managed carefully, and their integration needs to be thoroughly considered in the planning period and during their usage careful management and adherence to proper timing is essential.

Animal Tractors: use animals to clear land, such as chickens in the garden, goats on a bramble patch, or pigs to help turn over a potato field.
Pest Control: integrate specific plants to create refuges for beneficial insects such as those from the plant families of aster, umbel, and mint. Additionally design in bird and bat houses, small ponds, rock and stick piles as well as large hollow logs to create habitat for various species such as small reptiles.
Fertilizers: use the manure from animals to create soil as well as diverse plantings that include nitrogen fixing plants (alfalfa, clover, black locust) as well as dynamic accumulators (comfrey, nettles) so that chop and drop can be employed.
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