Factors affecting the ripening process of different rice cultivars.

Shading during the Early Grain Filling Period Does Not Affect Potential Grain Dry Matter Increase in Rice

“…However, accelerated leaf senescence was not observed in our experiments. In the grain filling period, in contrast to the tillering stage, nutrient absorption may not be active (Yoshida, 1981) Low grain dry matter increase caused by lack of assimilate supply under shaded conditions may result in N retention in leaves, as 70 to 80% of the N in harvested rice grain originates from leaves (Mae and Ohira, 1981) High N concentrations in leaves increase dry matter production through acceleration of photosynthetic rate (Evans, 1996; Tsuno and Wang, 1988). Our results suggest that heavy shading caused the distinct decrease in dry matter production, which in turn contributed to N retention in the leaves after the shading was removed.…”

Early Planting and Early Nitrogen Application Increase Stem Total Digestible Nutrient Concentration and Yield of Forage Rice in Southwestern Japan

“…There is also competition between the sinks (i.e., panicles) and the sources (i.e., leaves and stems) for starch during the second starch accumulation period (Tsuno and Yu, 1988). In the present study, the ratio of stem DM to panicle DM was increased by early planting (Fig.…”

Effects of Inabenfide (4’-chloro-2’-(α-hydroxybenzyl)-isonicotinanilide) on Growth, Lodging, and Yield Components of Rice

“…The advantage of a large leaf area per grain for ripening has been suggested by Matsushima (1976) and Tsuno et al (1988) . In fact, the clipping of primary rachis branches, which results in the increase in leaf area per grain, increased the percentage of ripened grains and the 1000 grain weight in some rice cultivars (Seo, 1980;Kato, 1986) .…”