Fig. 3.

CO₂ supplementation improves the quantity and quality of soybean flowers in the growth chamber. (A) Number of days to flower initiation after sowing soybean seeds in growth chambers with (+) or without (−) supplemental CO₂. Error bar = SD. n = 8. (B) Number of healthy flowers produced during the first 5 d of flowering in growth chambers with (+; n = 4) or without (−; n = 8) supplemental CO₂. Error bar = SD. (C, D) The number of healthy flowers produced each day for the first 5 d of flowering for plants grown with (C, n = 4) or without (D, n = 8) supplemental CO₂. **P < 0.01, n.s. no significant difference.