This study was conducted to examine the effects of tilling and seeding methods on the growth of rice direct-seeded in well-drained paddy fi eld. The tilling methods used were plowing, non-tilling, and non-tilling-V-shape furrowing. The seeding methods used were dibbling at 1, 3 and 5 cm depth under the plowing condition, dibbling at 1 and 3 cm depth under non-tilling condition, and shallow and deep soil covering under the non-tilling-V-shape furrowing condition. Cultivar Koshihikari was used in this study. The percentage of emergence in most plots was higher than 70%, except for dibbling at 5 cm depth under plowing condition. Mesocotyl and the second internode elongated in some plots. In all plots, non-productive tillers rarely appeared. Many panicles differentiated on the tillers at nodal positions higher than the fourth node from the neck node of panicle, except for the plants seeded by dibbling at a 1 and 3 cm depth under a plowing condition. Dry matter weights of leaves and culms in direct-seeded plants were biased to the lower part of the plants compared with the transplanted plants. As a whole, the plants seeded by soil covering under non-tilling-V-shape furrowing condition showed the best growth, although there is a possibility of lodging in the fi eld. When seeded by dibbling at a 3 cm depth under a non-tilling condition, the emergence was good and the lodging was not observed, but the panicle number was somewhat low.
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