lily_merry你好，此文章实际上是1992年的，06年传至网上

Journal of International Development: Vol. 4, No. 5, 477-496 (1992)

TECHNICAL CHANGE, PRODUCTIVITY,AND SUSTAINABILITY IN IRRIGATED
CROPPING SYSTEMS OF SOUTHASIA: EMERGING ISSUES IN THE
POST-GREEN REVOLUTION ERADEREK BYERLEE*
International Maize and Wheat Improvement Centre (CIMMYT), Mexico
Abstract: Recent trends in the productivity of South Asia's irrigated cropping systems are
reviewed with emphasis on the large, densely populated Indo-Gangetic plains of Pakistan
and India and parts of Bangladesh, where wheat is an important crop. Technical and
institutional problems emerging in these areas may seriously impinge on the ability to
maintain the gains in food-grain productivity and sustain the resource base in the next
two decades. Future productivity increases in South Asian cropping systems depend on a
new strategy that implies profound changes in agricultural research priorities and in the
institutions that foster technical change in agriculture.

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