Effect of Seeding Time and Cultivar on Total Carotenoids Content and Color of Soybean Seeds

Quality of Soybeen Seeds Grown in Japan Part XVI

Abstract

In order to evaluate the effect of seeding time and cultivar on the total carote noids content and color of soybean seeds, 8 cultivars grown at intervals of 20 days on 5 seedi ng times from May 9 to July 28 in 1975 were examined. The later the seeding time was, the high higher the total carotenoids content, color values of x and y of soybean flour and y of defatted soybean flour were observed. Compared with first culture, the last culture was 1.1 to 2.7 time s in total carotenoids content. Onthe total carotenoids content and color value, significan t differences were observed among the cultivars except x color value of defatted soybean flour and among seeding times except Y% color value of soybean flour. From the contribution rati o of seeding time and cultivar, total carotenoids content and color values of soybean flour (except Y% value) and of defatted soybean flour were highly affected by seeding time. As to the total carotenoids content and color, sum total of days of seeding to flowering, seeding to maturity, and flowering to maturity, and accumulated daily mean temperature duri ng ripening correlated negatively with total carotenoids content and x and y values of soybean flour color and with y value of defatted flour color. Total carotenoids content correlated positively with x and y values of soybean flour color and with y value of defatt ed flour color. In the color of both flours, Y% value correlated negatively with x value.