Table 3 Interaction of light spectra and stress (salinity and alkalinity) on vegetative characteristics of two lettuce cultivars.

103.30 ± 2.8^c

16.60 ± 0.6^b

5.90 ± 0.69^c

1.55 ± 0.13^a

34.32 ± 0.5^b

20.40 ± 0.4^b

46.90 ± 1.8^ab

95.00 ± 0.2^d

16.60 ± 0.3^b

5.00 ± 0.06^d

1.42 ± 0.11^ab

31.30 ± 0.6^c

13.30 ± 1.2^e

36.10 ± 4.2^c

40.00 ± 5.0^h

15.00 ± 0.1^c

2.58 ± 0.14^g

1.20 ± 0.04^c

22.30 ± 0.6^g

11.50 ± 0.4^f

35.70 ± 1.7^c

138.80 ± 3.4^a

20.50 ± 0.8^a

9.21 ± 0.11^a

1.46 ± 0.18^ab

43.00 ± 2.0^a

21.60 ± 1.3^a

49.30 ± 2.6^a

125..00 ± 5.1^b

16.60 ± 0.6^b

7.74 ± 1.22^b

1.37 ± 0.06^b

40.60 ± 3.5^a

18.16 ± 0.6^c

45.40 ± 0.1^b

70.00 ± 5.0^e

13.60 ± 1.5^d

3.90 ± 0.29^f

1.02 ± 0.09^d

30.00 ± 0.1^cd

14.90 ± 0.6^d

33.40 ± 0.7^cd

50.00 ± 0.1^g

6.38 ± 0.5^g

2.32 ± 0.27^g

0.56 ± 0.05^ef

24.60 ± 1.2^fg

12.60 ± 0.5^e

33.10 ± 3.2^cd

33.30 ± 2.9ⁱ

5.10 ± 0.6^h

2.19 ± 0.16^g

0.42 ± 0.04^fg

18.60 ± 1.1^h

10.50 ± 0.6^g

26.30 ± 1.5^fg

21.60 ± 2.8^j

2.51 ± 0.4^jk

0.98 ± 0.11^h

0.26 ± 0.05^h

17.30 ± 0.6^hi

8.70 ± 0.7^h

28.10 ± 1.6^ef

63.30 ± 2.9^f

13.30 ± 0.6^d

4.60 ± 1.78^de

1.50 ± 0.11^ab

35.00 ± 0.1^b

7.90 ± 0.7^h

31.00 ± 1.3^de

47.30 ± 2.5^g

3.29 ± 0.2^ij

3.01 ± 0.10^fg

1.06 ± 0.12^d

26.30 ± 2.3^ef

6.90 ± 0.4ⁱ

26.30 ± 5.8^fg

6.90 ± 0.2^l

3.78 ± 0.2ⁱ

0.77 ± 0.06^h

0.21 ± 0.01^hi

13.00 ± 0.1^j

3.24 ± 0.1^lm

27.50 ± 0.9^efg

37.00 ± 2.5^hi

10.06 ± 0.1^e

2.07 ± 0.63^g

0.58 ± 0.01^e

28.60 ± 1.5^de

5.40 ± 0.6^j

28.00 ± 0.9^f

15.00 ± 1.0^K

8.32 ± 0.9^f

1.07 ± 0.05^h

0.43 ± 0.02^fg

26.30 ± 2.5^ef

4.80 ± 0.3^jk

23.80 ± 1.1^gh

14.30 ± 5.7^K

1.61 ± 0.3^kl

0.92 ± 0.09^h

0.19 ± 0.01^hi

23.30 ± 0.6^g

4.00 ± 0.1^lm

24.10 ± 1.0^fgh

9.90 ± 0.1^Kl

3.31 ± 0.1^ij

0.56 ± 0.06^h

0.40 ± 0.02^g

18.30 ± 0.5^h

4.20 ± 0.1^kl

25.90 ± 0.1^fg

6.30 ± 0.6^l

2.09 ± 0.1^kl

0.53 ± 0.07^h

0.20 ± 0.03^hi

15.60 ± 1.2ⁱ

3.80 ± 0.3^lm

20.60 ± 0.8^h

4.50 ± 0.3^l

1.31 ± 0.3^l

0.46 ± 0.03^h

0.11 ± 0.02ⁱ

13.00 ± 0.6^j

3.04 ± 0.3^m

12.90 ± 0.5ⁱ