In Asia, polyculture rather than rotation is more common. Many plants and animals can grow side-by-side. Native Americans on this continent used polyculture interplanting corn, beans, and squash. In some parts of Asia, fish would be grown in the rice patties. Algae would be used to produce nitrogen. The production fowl in the system helped to create the threat of bird flu.
An old book, Farmers of 40 Centuries, describes how sustainable the system was. -- Michael Perelman Economics Department California State University Chico, CA 95929 Tel. 530-898-5321 E-Mail michael at ecst.csuchico.edu michaelperelman.wordpress.com
