抄録
The relationship was examined between the number of ears and the number of crown roots grown above 5 cm in length on a hill of rice plants. Total 92 hills were gathered from paddy fields of farnlers ahd of the experimental stations in Japan, as well as from experimental frames and pots in the university field. A positive close correlation (r= +0.819) was found between the number of ears (Y) and the number of grown crown roots (X) of a hill of rice plants with a regression formula of Y=28.3X+107.
