Table 3

Influence of reduced light levels by increasing copper sulfate concetraton in the spectral filter on dry weight. Control (water) filter grown plants were shaded byce ot to match the light levels in both control and corresponding copper sulfate filter. 

CuSO4conc.
Shading (%) Total shoot d.w. (g) Leaf d.w. (g) Stem d.w. (g) Root d.w. (g)
0 26 2.23 a 1.60 ab 0.63 a 0.6
  36 2.30 a 1.70 ab 0.60 a 0.6
  47 2.02 b 1.50 b 0.52 b 0.5
      
4 26 1.52 c 1.24 c 0.28 c 0.5
8 36 1.21 d 1.01 d 0.20 d 0.3
16 47 1.34 d 1.10 d 0.24 cd 0.3

 Means with same letter (within a column) are not significantly different.