only a linear model forced through the origin could be fitted to
this genotype. Estimate of RUE for NL-6 (1.30 ± 0.07) only tended to
differ (p < 0.08) from that of CO-407 (1.02 ± 0.34) but was similar to
those of other cultivars for cumulative IPAR lower than the breakpoint
(1.15 ± 0.19 and 1.19 ± 0.18 for RU-5 and Faro, respectively).
For cumulative IPAR higher than the breakpoint, no significant differences
were observed among cultivars (2.04 ± 0.45, 2.12 ± 0.18,
and 2.95 ± 0.27 for RU-5, CO-407 and Faro, respectively)