抄録
1) The length of each of all leaf-blaeds and-sheaths internodes of the main-stem, were measured on 9 rice plants sampled every other day since transplanting, intending to know the elongation process of each leaf and internode and further to make clear the interrelations between them. 2) The rate of elongation of each leaf and internode was very slow during the time from its differentiation till it reached 1.0cm and 3-5mm in length respectively, taking about half a month by that time, and another half a month thereafter till elongation ceased.(Fig.3, 4) 3) The elongation curves of leaves and internodes were so-called “S-curves", the former being composed of 2 S-curves which represented the elongation of blade and sheath of a leaf respectively.(Fig.1, 4) 4) When the blade of the 10th leaf, for instance, began its rapid growty, the 9th leaf-blade and the 8th leaf-sheath projected together--always the former was a little longer --above the top of the 7th leaf-sheath. When the blade of the 10th leaf attainde its full size, its sheath still continuing go grow, the internode below its base might be 2 or 3mm long. All internodes, which were due to grow long, did so after the leaves borne at their respective upper ends had ceased to do so.(Fig.4) 5) As the locus went up, the leaves beared blades successively larger and attainde its maximum in the 3rd (Norin No.17) or 4th(Norin No.8) leaf from the boot leaf, the blade of which was shorter and broadest than that of its predecessors.(Fig.2)
