USDA ERS - Increased productivity now the primary source of growth in world agriculture

The average annual rate of global agricultural growth slowed in the 1970s and 1980s but then accelerated in the 1990s and 2000s. In the decades prior to 1990, most output growth came about from intensification of input use (i.e., using more labor, capital, and material inputs per acre of agricultural land). Bringing new land into agriculture production and extending irrigation to existing agricultural land were also important sources of growth. Over the last two decades, however, the rate of growth in agricultural resources (land, labor, capital, etc.) slowed. In 2001-10, improvements in productivity—getting more output from existing resources—accounted for more than three-quarters of the total growth in global agricultural output, reflecting the use of new technology and changes in management by agricultural producers around the world. This chart is found in the ERS data product, International Agricultural Productivity, on the ERS website, updated November 2013.
@ USDA ERS - Chart: Increased productivity now the primary source of growth in world agriculture: