duckweed or at a concentration
≤0.1 g DW eq. extract mL−1 of
water lettuce, the inhibitory effect decreased over time and did
not suppress germination 48 h after incubation. Increasing the
extract concentration resulted in stronger inhibition. Applying
0.1 g DW eq. extract mL−1 of duckweed completely inhibited the
percent germination of cress. Likewise, the percent germination of
cress was completely inhibited by water lettuce aqueous methanol
extract at 0.3 g DW eq. extract mL−1.