Highly technical report from a composting study on using biofertilizer, natural minerals, and organic residues to control pollution, recover degraded soil, and improve the substratum. By Dr. Pedro Cairo of Universidad Central de las Villas, Santa Clara, Villa Clara.
An agronomist, professor, and researcher at the University of Cienfuegos, Cuba, writes briefly of the development of urban agriculture in his city. Includes graphs and photos.