A towering machine rumbles through the fields of Julio Rinco's farm in the Brazilian state of Sao Paulo, engulfing whole coffee trees and shaking free beans that are collected by conveyor belts in its depths.

This automatic harvester is one of several innovations that have cut Rinco's production costs to a level that few who use traditional, labor-intensive methods can match.

With increasing use of mechanization and other new technologies, the world's top two coffee producers, Brazil and Vietnam, are achieving productivity growth that outstrips rivals in places such as Colombia, Central America and Africa.