In early cultivation, rice seedlinge-var. Norin No. 17 and var. Tomoemasari were grown under conditions by different sowing dates, nursery periods and transplanting dates, and the relation of their morohorogical charaters to the growth and yield inpaddy field were examined. This investigation was carried out from 1955 to 1957. Cenerally, the growth of seedlings were quickend in the years favoured by higher by higher temperature, and greater rate of dry weight to fresh weight was obtained in the years favoured by sufficient linensity. The seedlings developing the 4∼5 th leaf were found to be most suitable for transplanting. They showed quick rooting and vigorous growth soon after traushlanting, although their later growth as well as grain yield were not remarkably affected.
