Fig. 2. Days to first flower as a function of photoperiod at two temperatures (28 and 18°C) for five photoperiods and six isolines of soybean. Lines are model calculations. Error bars are standard errors of the mean. Photoperiods were 10, 12, 14, 16 and 20 h but some data are offset by plus or minus 0.2 h for clarity.

Return to article