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概要：
Recent Adoption and Spatial Diversity of Modern Rice Varieties in the Philippines 109Table 3. Indices of adoption rates of new varieties, by season and farm type, The PhilippinesYear/SeasonEcosystemtN....

Recent Adoption and Spatial Diversity of Modern Rice Varieties in the Philippines 109Table 3. Indices of adoption rates of new varieties, by season and farm type, The PhilippinesYear/SeasonEcosystemtNo. ofreleasedvarietiesplantedaProportionsown torecentvarietiesb(It:% )Weightedaverage ageof varietiesc(WAt :yr)Most recent varietyused Oldest variety usedVariety Yearreleased Variety Yearreleased1992 WS Irrigated 39 32.89 8.92 PSBRc6,-10,-12May, 1992 IR8,C4-63G,BPI761968Rainfed 37 20.10 9.90 PSBRc2,-4Nov., 1991 IR8,-5,C4-63G,BPI7619681993 DS Irrigated 34 37.01 8.31 PSBRc8,-10,-12,-14May, 1992 IR8,C4-63G,BPI761968Rainfed 8 10.28 14.27 IR72 1988 IR36 19761996 WS Irrigated 53 51.38 8.93 PSBRc5,-54,-56, -60Nov. 1997 IR20 1969Rainfed 45 43.45 10.09 PSBRc3,-5,-60,-72HNov. 1997 IR20 19691997 DS Irrigated 49 54.71 8.41 PSBRc3,-5,-54,-60Nov. 1997 IR20 1969Rainfed 38 57.40 8.76 PSBRc5 ,-60, -68Nov. 1997 IR20 19692001 WS Irrigated 47 23.52 10.81 NSICRc122,PSB Rc90, -94Dec. 2003,Jan., 2001BPI Ri3 1973Rainfed 49 28.88 11.20 PSB Rc90/ -94Jan., 2001 IR29, IR32 19752002 DS Irrigated 54 35.97 9.50 PSBRc90,-94,-98,-100Jan., 2001 IR29, IR32 1975Rainfed 49 32.01 10.21 NSIC Rc122,PSBRc 94,-100Dec. 2003,Jan., 2001IR42 1977AVERAGE OF 3 SURVEYSWS Irrigated 35.93 9.55Rainfed 30.81 10.40DS Irrigated 42.56 8.74Rainfed 33.23 11.08a This is the total number of released varieties mentioned by farmers. This does not include varietieswhich are not released by the Philippine seed board or now, the National Seed Industry Council, such asthe Masipag varieties or other selections or lines; traditional varieties; or farmer-selections or farmernamedb Proportion of recent varieties is an index showing the proportion of the area planted to varietiesreleased in the previous seven yearsc Weighted average age of varieties is an index of the average age of released varieties grown byfarmers, measured in years from varietal release and weighted by the proportion of area sown to eachvariety