The sprouting of barnyardgrass was significantly reduced (P b 0.05)
at all tested concentrations of leaf aqueous extracts. Conversely, only the
highest concentration resulted in the 90% reduction of germination in
weedy rice.Meanwhile, no significant reduction was observed in germination
when the T. tuberculata stem extract was applied at low concentrations
of 6.25, 12.5 and 25 g L−1. On the contrary, when the
concentration increased to 100 g L−1, the germination was reduced to
a range of 8–20% in the indicator weed species