Table 3 Average values of nitrogen balance (NBIG and NBIR), chlorophyll (SFRG and SFRR), flavonoids (FLAV) and anthocyanins (ANTHRG and ANTHRB) indexes of purple lettuce grown at different seasons.

From: Photo-selective shading screens as a cover for production of purple lettuce

Seasons

NBIG

NBIR

SFRG

SFRR

FLAV

ANTHRG

ANTHRB

Spring

1.07 b

0.59 b

1.50 a

1.30 a

0.30 a

0.173 a

− 0.736 a

Autumn

1.89 a

1.22 a

1.12 b

0.89 b

− 0.14 b

0.135 a

− 0.733 a

CV%

7.61

15.05

11.00

11.39

22.99

19.37

2.48

  1. Means followed by the same letter do not differ from each other at the 5% probability level (p < 0.05) by the Tukey test.
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