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Table 6 Average data collected under layered color temperature blue (CTB) neutral density (ND) filters

From: Layering contrasting photoselective filters improves the simulation of foliar shade

Filter(s)

R:FRa

PPEb

B:Gc

PPF reductiond

UV-A PFe

    

%

µmol m−2 s−1

0.15 NDf

0.84 Bg

0.68 B

0.86 K

36.0 K

45.5 A

0.30 ND

0.61 D

0.64 E

0.88 K

54.0 H

32.3 BCD

0.60 ND

0.30 H

0.53 J

0.91 J

79.7 C

12.5 HI

1/8 CTB

0.92 A

0.70 A

0.94 I

24.3 L

18.6 FGH

1/4 CTB

0.71 C

0.67 C

1.05 F

35.0 K

17.9 GH

1/2 CTB

0.51 E

0.63 F

1.22 C

45.7 J

22.9 EFG

1/8 CTB

     

+ 0.15 ND

0.62 D

0.65 D

0.96 HI

48.7 I

37.3 AB

+ 0.30 ND

0.45 F

0.61 H

0.98 H

63.3 F

26.8 CDEF

+ 0.60 ND

0.22 I

0.49 K

1.00 G

83.7 B

9.9 HI

1/4 CTB

     

+ 0.15 ND

0.49 E

0.62 G

1.08 E

57.7 G

34.6 BC

+ 0.30 ND

0.35 G

0.57 I

1.09 E

69.3 E

23.9 DEFG

+ 0.60 ND

0.18 J

0.45 L

1.12 D

86.7 A

9.0 I

1/2 CTB

     

+ 0.15 ND

0.34 G

0.57 I

1.25 B

65.3 F

30.7 BCDE

+ 0.30 ND

0.25 I

0.52 J

1.27 B

74.7 D

23.6 DEFG

+ 0.60 ND

0.13 K

0.40 M

1.31 A

88.7 A

7.8 I

  1. aR:FR = 655–665/725–735
  2. bPPE = Phytochrome photoequilibria
  3. cB:G = 420–490/500–570
  4. dPPF reduction = Percent reduction in PPF relative to full sun
  5. eUV-A PF = Photon flux between 340 and 399 nm
  6. fRosco Cinegel was used for CTB and Rosco e-colour + was used for ND filters
  7. gData are presented as averages acquired on three different clear sky or mostly sunny days between 13:00 and 14:00 h: 27 May, 30 May, and 12 June 2020. Means are only compared within column and were separated with Fisher’s LSD. Means followed by a common letter are not significantly different (P = 0.05). Data collected under full sun were on average; R:FR = 1.15, PPE = 0.72, B:G = 0.87, PPF = 1719 µmol m−2 s−1, UV-A PF = 86 µmol m−2 s−1