Fumigation treatment | Sulfur content (%)2 | |||
---|---|---|---|---|
Black locust | Black cherry | Siberian elm | Yellow-poplar | |
SO2 | 0.756c | 0.182c | 0.232ab | 0.763bc |
NO2 | 0.406a | 0.145b | 0.189a | 0.672ab |
SO2 + NO2 | 0.623b | 0.095a | 0.268b | 0.666ab |
Control | 0.366a | 0.159bc | 0.185a | 0.582a |
↵1 Environmental conditions during fumigation: 25/20 C day/night thermoperiod; 50 ± 10% relative humidity; 16-hr photoperiod at 250 E m−2s−1 PAR.
↵2 Each value represents the mean of either 15 seedlings (black locust and black cherry) or 30 seedlings (Siberian elm and yellow-poplar). Mean separation within columns by Duncan‘s new multiple range test, P = 0.05. Seedlings of Siberian elm, yellow-poplar, and black cherry fumigated 5 days weekly; seedlings of black locust fumigated 7 days weekly.