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Sources of growth in wheat yields in Pakistan's Punjab, 1965-2000: is there a sustainability issue?
Wheat yields rose rapidly in the Punjab of Pakistan during the Green Revolution decade, 1966-76, but the rate of growth has been significantly slower in the decade that followed. Official statistics indicate that the yield ...
The maize subsector in Paraguay: a diagnostic overview
The maize sector in Paraguay s going through a period of perplexing changes. Despite recent production gains, average maize yields remain far below those which could be achieved with relatively simple changes in management ...