2010--1nnnnnnnn22nnnnqqqqqqqq334420032003““””““””qqqqqqqqqqqq““””““””qqØØØØqqØØØØØØØØØØØØØØqq““””nn1122nnnn1122112233153020042009650nnnnuu““””uu““””nn11nnnnnnnnnnnnScottScottRozelleRozelle233nnnnnnnnnnnn181820201990199020202.3%2.3%10%10%2030203050%50%nn2000200077.5%77.5%nn700700300300nnnn606010.210.266112050205050%50%9090909020092009nn20092009111116161818““””““””nn10103“820”1.1.2.2.0.3720205.030.375.030.90“”u65202580nnØØnnØØØØØØnnØØ“”newgreenrevolution——n60nnn((Pitic62,CIMMYT1962IR8IRRI1966CGIAR(consultativegrouponinternationalagricultural)nnnn““””““””““””üüüü•25(S.Cassman1999);•30(S.Robert1999).205008.012.0(t/ha-1)J.sheehy,2000)nnnnnn--*?ØØØu1122100010003344nnnn••nn11nnnnnnnn1000100055————5.455.45nnnnnnnn112233nnnnnnnnnn11——----————————————--------------------**948948------——----------------------——**------------……………………..nnnnnnuuuuuu““””nnnn““””nn““””nn““””nn““””nn““””nnnnnnnnnnnn1.21.2))““””““””““””u86u6995u“”——“”“”uu404050501010151510101515202055101010%10%20%20%20%20%20%20%34583458342342ØØpppppp————————————pp665544332211998877/121211111010ThanksThanks