A practical guide (including charts and planning grids) for growing more food in a smaller area: double digging, compost making, plant spacing, and biodiversity settings. The biointensive method is based on the 40 years experience of John Jeavons with the non-profit Ecology Action. Biointensive growing aims for larger yields from smaller spaces while also improving soil quality, working toward a closed-loop system of fertility. Through minimizing land use for food production, more land can be set aside for biodiversity and ecosystem regeneration, while responding to the nutritional needs of a society faced with land scarcity and overpopulation in the coming post-fossil fuel era.
Exerpts can be seen here.
JEAVONS, John. How to Grow More Vegetables (and Fruits, Nuts, Berries, Grains, and Other Crops) Than You Ever Thought Possible on Less Land Than You Can Imagine. Ten Speed Press, 7th edition, 2006, 288 p.