There are examples to take, even for the individual http://jackyquetzalyne-monespacevert.ek ... iointensifCuba transformed large plots into small areas carried out in polyculture because of an embargo since the 70s.
In order to feed the population, a major land reform was imposed, an urban subsistence agriculture was born.
This involuntary change, however, allowed Cuba to turn to new natural production techniques as oil, fertilizers and pesticides became scarce.
Organic micro-gardens were born by maximizing yields and minimizing energy and financial expenses.
A very interesting document describing the techniques to be used http://www.aveyron-bio.fr/fr/produisez- ... e-plus.pdf