Abstract
Using high tillering semidwarf indica, IR36, and panicle type and low-til1ering japonica, Koganenishiki (KN), varietal differences of tillering response to shading and nitrogen (N) levels were studied in respect to dry matter production. Though the number of tillers in both varieties grown under conditions combined three shading (0, 44, 7%) and three N (10, 20, 40ppm) levels reduced in proportion to lowering light intensity and N level, the maximum tiller number of IR36 in each plot was 2-2.5 times higher than KN, and the ratio to control plot (no-shading and 20 ppm N) was higher in IR36 than KN, especially in the highest shading plot. These results show that IR36 has stable tillering ability in comparison with KN, irrespective of environmental conditions. The number of tillers in both varieties increased in proportion to increasing the top dry matter production, but that at the same top weight was higher in IR36 than KN. This varietal difference was based on the higher dry matter partitioning ratio to tillers in IR36 and it was almost the same in the no-shading plot in KN and in the 77% shading plot in IR36. On the other hand, fluctuation in the number of tillers by shading and N levels in both varieties was brought about through the amount of dry matter production.
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