Abstract
Experiments were conducted in the first and second crop seasons of 1978 to study the seedling quality and the changing patterns of N, total non-structural carbohydrates (TNC) and chlorophyll concentrations throughout the growth course of machine-transplanted rice. Differences in seedling quality were more significant between crop seasons than between varieties at the leaf ages of 3.1 to 3.3. Seedlings raised in the first crop possessed high ratios of dry weight/height and TNC/N than those of the second crop. Nitrogen conentration in leaf blades was higher in Tainan No. 5 (japonica) than in Taichung sen No. 5 (indica) rice. TNC accumulation in culms before heading was more pronounced in the indica variety; however, the subsequent decline during grain-filling was also faster as compared with the japonica rice Tainan No. 5. Highest chlorophyll concentration was recorded at booting stage in the first crop and at maximum tillering stage in the second crop rice. Changes in concentrations of chlorophyll and TNC were parallel to each other in both seasons. The marked decreases in levels of TNC and chlorophyll after heading, along with the lower ripened-grain percentage and 1000-graia weight, suggested insufficient supply of photosynthetic assimilates in the second crop rice.
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