Abstract:
Determination of allelopathic effect and control of chinese wedelia (Sphagneticola calendulacea)
was conducted during November 2022 to February 2023 at Sher-E-Bangla Agricultural
University, Bangladesh. Experimental results used evaluated in germination percentage and
germination inhibition of different crops and to identify how other crops were affected by this
weed. Sphagneticola calendulacea was identified using the visual method, and quadrates were
used to determine the total biomass and relative biomass of the weeds. The infestation density of
Sphagneticola calendulacea were found along roadsides, in fallow land, grasslands, and in some
crop fields. The highest abundance of Sphagneticola calendulacea occurred at fallow land. The
allelopathic activity of Sphagneticola calendulacea was examined against the seed growth of
seventeen crop species including major cereals, pulses, oilseeds, weed seed, and vegetables. 5%
aqueous leaf extract and 5% aquas leaf extract with methanol was used to investigate the
allelopathic activity of Sphagneticola calendulacea to seeds and post-germinated seeds (both
radicle and plumule are emerged) of test species. The following three parameters were used in
allelopathic screening methodologies (a) germination percentage (%), (b) radicle length (cm),
and (c) plumule length (cm). Results of Petri dishes treated with methanolic extract or leaf
extract shown a complete failure of germination (0%) due to the treatment in rice, jute, cowpea,
black eyed pea, pea and chickpea. Among the cereals, rice had the greatest reduction in radicle
and plumule length (100%) and maize had the lowest (61% and 53%, respectively) compared to
the respective control with methanol extract. Whereas, the leaf extract increase growth of radicle
and plumule in both rice and wheat and highly decrease in maize and slightly in jute. For
controlling this weed Filder (2,4,D-Amine) highly reduce (48%) the total biomass of the
Sphagneticola calendulacea than Sunup 480 SL (glyphoset) and Weednil 5EC (Quizaloph-PEthyle)
7% and 8%, respectively. Therefore, an integrated management approach is urgently
needed to control the spread of this invasive weed.
Description:
A Thesis
Submitted to the Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the
requirements for the degree of
MASTER OF SCIENCE
IN
AGRONOMY
