Similar to RGR, NAR also increased as the weeks
increased. Oil palm seedlings enriched with CO2 gave the
higher NAR than control seedlings (Fig. 5) from weeks 6
to 15 although differences in NAR between treatments
were only observed significant on week 15. NAR on the
latter week was found to increase by 124 and 113% for
1,200 and 800 lmol/mol treatments, respectively, compared
to the control (400 lmol/mol).