Ernst Goetsch - Break trough in agriculture

see this interesting articel from Ernst Goetsch about Agroforestry here:

http://ecotop-consult.de/files/ernst_goetsch.pdf

and another articel on Natural Succession and Soil Recovery here:

http://media0.agrofloresta.net/static/artigos/agroforestry_1992_gotsch.pdf