Tsukuda Katayama

Suppression of Growth of Leaves in Rice Seedings Fixed in a Horizontal Position.

Rice seedlings grown in pots were fixed with their axis in a horizontal position and checked from upward bending for about ten days at each of six different stages of growth of their seventh leaves, as mentioned in the figure, and then were allowed to grow vertically. When the eleventh leaf emerged out from the sheath, measurements were made on the length of both sheathes and blades of all the individual leaves. As a result of the measurments, the growth of both sheathes and blades were more or less suppressed, according to their stages of embryonic development when they were displaced into a horizontal position, being hidden within the sheathes. The extents of the growth-suppression in the seventh, eighth, ninth and tenth leaves in comparison with those leaves of the control plants are illustrated in the figure.

The Effect of Night Mulching with Straw Mat upon the Growt of Wheat Seedlings during Nursery Period

Wheat seedlings were trampled three times during nursery bed, as similar to those carried on in farm practice (B. in figure); or mulched on the seedlings directly with straw mat every night, for the purpose of accelerating the tillers and the stout growth of the seedlings before transplantation (C. in figure). The result turned out according to the authors expectation, as shown in the figure.