III. Bioassay screening of plant extracts: Seeds of four types of weeds were
placed in 9.0 cm diameter Petri dishes, moistened with 5.0 ml of different
extracts obtained from plants, while control received distilled water in equal
amount. Petri dishes were placed in a dark place at 20± 2°C for 10 days. Ten
seeds were used per each treatment and replicated four times. Length of radical
and plumule with dry weights were recorded at the end of 10 days period. All
data were statistically analyzed using F. Test and differences between
treatments comparing by Duncan’s Multiple Range Test at 1% level of
probability (Steel and Torrie, 1980).