In order to explain the relation between the growth of mondo grass (
Ophiopogon japonicus Ker. forma
nanus hort.) and relative light intensity (RLI), mondo grass was grown under 6 degrees of the RLI...100% (full sunlight), 71%, 56%, 32%, 19% and 7%. The results are as follows.
1) Mondo grass grew best under the RLI of 56%. Under the RLI of 100%, 71%, 32% and 19%, its growth was a little inferior to that under the RLI of 56%. Under the RLI of 7%, its growth was remarkably inferior to the other plots, but it didn't stop its growth.
As the RLI was lower, the ratio of top dry weight to root dry weight (T/R) became larger.
2) The leaves of mondo grass turned yellow green and some of them died of sunburn under the RLI of 100% and 71%. As the RLI was lower, the leaves turned dark green.
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