Although there can be some differences among varieties, the developmental rate of soybean (Glycine max) is mainly influenced by temperature and photoperiod. The objective of this experiment, that is the first step for creating phenology model of soybean, is to investigate the developmental characteristics under different temperature and day length conditions. Considering maturity, employed were five cultivars, Hwaeomputkong, Sinpaldalkong, Taegwangkong, Daewonkong, and Seoritae. They were sown at three different dates and grown under natural day length throughout growing season in 2008, while in another field they were subjected to longday of 16 hours by the supplemental lighting from July 6 to maturity. Developmental processes were investigated every five days after seeding. Days to flowering and final number of node increased in late maturiity cultivars. These traits decreased in delayed seeding, while increased under longday treatment. Even though there were some varietal differences in the slope of the line, V-stage(the number of nodes) of soybean consistently showed the linear relation(r2>0.95) with the sum of effective temperature from emergence to flowering. Daylength would be a cardinal factor that determines development including final number of node and duration of reproductive stage. However, it has not been figured out completely. Further studies will focus on the effect of temperature on reproductive stage and developmental response to daylength.

자주초롱꽃, 기린초, 동자꽃, 용머리 등 4종의 자생화에 일장 8시간 12시간, 16시간과 자연일장을 처리하여 일장처리에 따른 생육 및 개화반응을 살펴 본 결과 자주초롱꽃은 단일조건일수록 초장이 적었으며 개화는 단일보다는 장일조건이 약 10일 빨랐고 화수도 많았다. 기린초는 일장 8시간과 12시간에서 초장이 짧고 분지가 많이 생겼으며 분지가 로젯트화 되어 짧게 붙어 있고 개화가 되지 않았으며 장일조건과 자연일장에서는 각각 7월 23일과 8월 5일에 개화되었다. 동자꽃 역시 단일조건에서는 초장이 짧고 화수가 적었으나 장일조건으로 갈수록 초장이 길고 화수가 많았다. 용머리 또한 단일조건에서는 초장이 짧고 화수가 적었으나 장일조건으로 갈수록 초장이 길고 분지수와 화경수가 많았다.