A STUDY ON THE RELATIONSHIP BETWEEN THE RESPONSIBILITY TO PHOTOPERIOD OF SOYBEAN (G. MAX) LEAVES AND SOYBEAN DEVELOPMENT

Soybean(G. max)leaves are sensitive part to photoperiod. The responsibility to photoperiod of cotyleden and rolled leaf defines the flowering node, and the responsibility to photoperiod of leaves defines the growth speed. Either short daylength or long daylength heightens the flowering node taking a time of 90% of delayed flowering days, and increases leaf age takinga time of 10% of delayed flowering days. Short daylength promotes the development of soybean, and long daylength promotes the growth of soybean. The responsibility to photoperiod of leaves during enlarging goes up 3 nodes, and in the course of going up there is the comprehensive balanced effect of responsibility to photoperiod. The duration of the resiponsibility to photoperiod of leaves is from the occurance of trifoliates to the time when the leaf falls into a pattern. We also piont out the optimum condition of light and temperature to study soybean ecology of light and temperature.