Red: far red ratio of light transmitted from the
rubber canopy was significantly lower than that in full
sunlight. When this light passed through the cinnamon
canopies, R:FR was further reduced and significant
differences existed between different density
treatments. There was a significant reduction in R:FR
in the highest density treatment (D1) compared to the
other three treatments while the treatment with the
lowest plant density (D4) had significantly higher
R:FR than in the other three treatments at all three
measurements. R:FR in D2 and D3 were comparable
in the first and second measurements (Table 2).