PRODUCTIVITY GROWTH IN WORLD AGRICULTURE: SOURCES AND CONSTRAINTS
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There have been substantial increases in our understanding of the process of agricultural development over the last half century. Yet the productivity gap between developed and developing countries has not narrowed. In this paper I assess (a) the resource and environmental constraints and (b) the scientific and technical constraints that will confront the worlds farmers as they attempt to respond to the demands that will be placed on them over the next half century.