Abstract:
The phytotoxic effect of different spices plant extract was investigated on the germination
and seedling growth of Okra (Abelmoschus esculentus) and barnyard grass (Echinochloa
crus- galli L.) with experiment carried out in Laboratory, Department of Agricultural
Chemistry , Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, during
the period from October 2019 to September 2020.The effect of spices plant extracts of
Clove, Black paper, Bay leaf, Cinnamon, Cardamom at the concentration of E0 (control;
no extract), E1 (0.01 mg dry wt. eq. extract/mL), E2 (0.03 mg dry wt. eq. extract/mL), E3
(0.1 mg dry wt. eq. extract/mL) and E4 (0.3 mg dry wt. eq. extract/mL) were studied on
germination, root and shoot length of okra and barnyard grass. The experiment was done
under Completely Randomized Design (CRD) with three replications. Results showed that
all the test plant species were inhibited under extracts of all spices plant. Results indicated
that all concentrations of plant extract had phytotoxic effect on okra and barnyard grass.
The concentration of 0.3 mg dry wt. eq. extract/mL completely inhibited the germination,
root and shoot growth both of okra and barnyard grass among all the concentration. At the
same concentration Clove extract showed the highest phytotoxic effect on seed germination
of okra (31%) and barnyard grass (30%). Again, in terms of root length of okra, Bay leaf
extract at the 0.3 mg dry wt. eq. extract/mL concentration showed highest phytotoxic effect
and gave lowest root length (0.71 mm). Similarly, Cinnamon extract at the 0.3 mg dry wt.
eq. extract/mL concentration on barnyard grass had the highest phytotoxic effect for shoot
and root length (0.75 and 1.3 mm, respectively). The above results suggested that tested
spices plant may have phytotoxins. Therefore, it is possible to use these extracts as a
component for production of bio-herbicides due to their phytotoxic effects on weeds and
crops and considered as a natural way for sustainable weed management.
Description:
A Thesis
Submitted to the Department of Agricultural Chemistry
Sher-e-Bangla Agricultural University, Dhaka-1207
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
AGRICULTURAL CHEMISTRY
