Yield performance of second-generation new plant type lines in the dry and wet seasons
2003
Laza, M.R.C. | Shaobing Peng | Visperas, R.M. (The International Rice Research Inst., DAPO Box 7777, Metro Manila (Philippines). Crop, Soil and Water Sciences Div.)
In 1999, the authors reported that yield performance of first-generation new plant type (NPT) lines relative to an indica check was better in the wet season (WS) than in the dry season (DS). Using a large number of second-generation NPT lines that were developed by crossing first-generation NPT lines with indica varieties, the relative performance between WS and DS in 2001 and 2002 were compared in breeders' replicated yield trials at the IRRI farm. As in the first-generation NPT lines, grain yields of second-generation NPT lines were generally higher in the DS than in the WS. Thirty-five out of 42 second-generation NPT lines in the 2001 DS and 50 out of 92 in the 2001 WS had equal or greater yield than PSBRc 18 check. In the 2002 DS, 56 out of 110 second-generation NPT lines showed similar yields as or greater yields than PSBRc 18 check. In the 2002 WS, only 9 out of 92 second-generation NPT lines had yields equal to or greater than PSBRc 18. It is clear that the yield performance of second-generation NPT lines relative to the indica check was better in DS than in WS, which is opposite that of the first-generation NPT lines. These data suggest that the second-generation NPT lines are more suitable for increasing rice production in high-yielding climate such as DS conditions in the tropics
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