From GM Watch

Scientific research shows that modern organic and low-input methods can massively increase yields on developing world farms and without triggering the plethora of problems associated with Green Revolution agricultureand GM.
http://www.gmwatch.org/archive2.asp?arcid=8107
http://www.gmwatch.org/archive2.asp?arcid=7370
http://www.gmwatch.org/p1temp.asp?pid=86&page=1

It's this kind of research that led New Scientist to editorialise:

"Low-tech 'sustainable agriculture,' shunning chemicals in favour of natural pest control and fertiliser, is pushing up crop yields on poor farms across the world, often by 70 per cent or more...

A new science-based revolution is gaining strength built on real research into what works best on the small farms where a billion or more of the world's hungry live and work... It is time for the major agricultural research centres and their funding agencies to join the revolution." (New Scientist editorial, February 3 2001)
http://www.gmwatch.org/p1temp.asp?pid=7&page=1