Resource-conserving Agriculture Increases Yields in Developing Countries 221referees for their helpful comments. The research was funded by the UK Depart-
ment for International Development. The views expressed in this paper are those
of the authors and do not necessarily reflect the policies of their organizations.
Supporting information
See Dixon and Gulliver (2001) for full details of the classification system developed
by FAO. This separates farming systems into eight types (irrigated; wetland rice
based; smallholder rainfed humid; smallholder rainfed highland; smallholder
rainfed dry/cold; dualistic; coastal artisanal fishing; urban-based) for six regions of
the world (sub-Saharan Africa; Middle East and North Africa; Europe and Central
Asia; South Asia; East Asia and Pacific; Latin America and Caribbean).
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