Water use efficiency (WUE; lmol CO2 assimilated/mmol H2O
loss) of oil palm seedling as affected by different levels of CO2 during
15 weeks of exposure. Data are mean ฑ SEM of 18 replicates. Mean
values followed by **P B 0.01 differ significantly by Duncan
multiple range test procedure. There were no progenies and interaction
(CO2 9 progeny) effects observed during the experimental
period