In contrast with the previous experiment, the results of this long-term study showed no statistically significant differences between growth variables tested for both bush bean lines as a direct result of CF and NF treatments. The presence of chambers, regardless of treatment, had opposite effects on the growth and yield of ‘R123’. When compared with plants grown in AA, they had significantly higher above-ground biomass and pod numbers. However, number of seeds and pod
weights per plant were significantly lower. It is noteworthy to mention that both bean lines had significantly higher seed weights when grown in AA (Fig. 2). The results from experiments 1 and 2 suggest that the ‘chamber effects’ on plant and yield may vary with different plant developmental stages.