Abstract
Growth behavior and relations between yield and several characters concerning growth and development of fiiber flax were studied with data of the Main Station, the Tokachi Branch, the Kitami Branch, and the Kutchan Subbranch of the Hokkaido Agricultural Experiment Station. And relations between yield of fiber flax and climatological conditions were also studied with the same data. Number of year studied was 24 for the Main Station and Kutchan, 25 for Tokachi, and 26 for Kitami. The results are as follows: The number of day from planting to flowering averages 55∼60, and its coefficient of variability lies between 7.4 and 8.5%. The number of day from planting to maturity averages 85∼90, and its coefficient of variability lies between 5.7 and 8.8%. Mean length of stem at late June varies for stations, and it is highest in the Main Station and lowest in Kutchan. At late July the stem length showes the same trend as before, but its defference becomes smaller. Mean yield of stem is highest in the Main Station and lowest in Kutchan. Highly significant correlations are obtained between yield and length of stem at late July in all places. Irrespective of the stations studied, correlations between yield and mean air temperature are generally positive in early period of growth, and become negative in the advanced period, but the coefficients are not statistically significant except two cases. Correlations between yield and amount of precipitation are generally negative in early growth period and become positive in the middle period. The hours of sun-shine may not affect the yield directly, and its effect may be shown in proportion to air temperature and in inverse proportion to amount of precipitation.
