Characteristics of dry matter production and partitioning of dry matter to panicles in high yielding semidwarf Indica and Japonica-Indica hybrid rice [Oryza sativa] varieties
1996
Miah, M.N.H. (Ehime Univ., Matsuyama (Japan)) | Yoshida, T. | Yamamoto, Y. | Nitta, Y.
A field experiment was carried out to investigate the dry matter production characteristics before and after heading, the partitioning of dry matter to panicles, and some related factors in high yielding semidwarf indica (SDI) and japonica-indica hybrid (JI) varieties in comparison with those of japonica panicle weight (JP) and panicle number (JN) type varieties transplanted in early and late cropping seasons (ET and LT). Leaf area indices (LAIs) of the Ji and SDI varieties in both ET and LT were higher at full heading, but decreasing percentages were much more prevalent in these varieties after heading, which resulted in much lower, LAIs than those of japonica varieties at maturity. Total top dry weights at full heading of SDI and Ji varieties were higher than those of JP and IN varieties in ET and Lt, except for Akenohoshi in LT. However, the difference in dry matter increment during the period from full heading to maturity (HM) among the varieties were not found to be significant. Crop growth rates (OGR) during HM of SDI varieties both in ET and LT were the lowest among the varietal groups due to the highest decreasing percentage of LAIs and SPAD readings at the later grain filling stage
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