Net photosynthesis (A; lmol/m2/s) 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