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accessions adopted MVs adoption of MVs agricultural agroecosystems average yield behavior BuakJan central irrigated villages chemical fertilizer Chiangmai Valley Dawk Mali different varieties discarded ecological eight villages ethnic factors farm area farmers grew fertilizer/variety trials Gaew Gamphai genes genetic diversity germ plasm glutinous rice GongHae Green Revolution grow grown hectare Hmong horizontal resistance households increased indicate innovative isozyme groups Japonica kg N/ha Khao Lamphun Lamphun Province land landscape Leuang Lisu LIVs MaeSalap MaeTha Valley maintain meters modern varieties monoculture MT/ha nitrogen northern Thailand NSPT number of varieties PaDaeng PaLaan PaLaan Farm PaNgiw Ping River planted rainfed farms rainfed villages random survey rice area rice crops rice varieties rice yields Samoeng sample area sample farmers SanPaHiang season seed soil species study area Table Tambon tested Thai farmers ThaMon top third two-wheeled tractors upland rice variability varietal diversity variety choices variety use patterns vertical resistance village level zone