3.2. Effects of aqueous methanol extracts on the growth of test
species
The aqueous methanol extract obtained from duckweed had the
strongest inhibition on the shoot growth of alfalfa and root growth
of timothy. This extract inhibited shoot growth of rye grass and
root growth of crab grass as much as it did shoot and root growth
of cress, which is very sensitive with inhibitory activity caused by
allelochemicals (Fig. 3). The growth of rye grass root was inhibited
more than that of cress root by this extract. The growth response
of each test species to the inhibitory activity of duckweed aqueous
methanol extract varied due to a concentration–test species