ALLELOPATHIC EFFECTS OF AQUEOUS EXTRACTS OF Carthamus tinctorius L. ON EMERGENCE AND SEEDLING GROWTH OF Echinochloa crus-galli L.
ALLELOPATHIC EFFECTS OF AQUEOUS EXTRACTS OF Carthamus tinctorius L. ON EMERGENCE AND SEEDLING GROWTH OF Echinochloa crus-galli L.
Muhammad Ather Nadeem1, Bilal Ahmad Khan*1, Sadia Afzal2, Ahsan Aziz1,
Rizwan Maqbool3, Muhammad Mohsin Amin1, Amir Aziz4, Amjed Ali1, Muhammad
Adnan1, Durrishahwar5
ABSTRACT
Plant secretions have ability either to promote or inhibit seed germination and
seedling growth of surrounding crops and weeds and this situation is termed as allelopathy.
Laboratory experiment was performed to determine the suppressive or simulative influence
of aqueous extracts of leaves, stem and fruit of Carthamus tinctorius L. at different
concentrations(0, 0.25, 0.50, 1, 2, 4, and 8%)on Echinochloa cruss-galli L. Results revealed
that 8%concentration of aqueous extracts of all tested parts of C. tinctorius was most
phytotoxic against germination as well growth of E. cruss-galli. Maximum mean emergence
time (5.60 days), minimum emergence index (1.87), time to 50% emergence (6.17 days),
minimum shoot (5.82 cm) and root length (1.91 cm) were recorded with the application of
leaf extract at 8% concentration of C. tinctorius. The E. cruss-galli emergence percentage
(53.33%) and seedling fresh biomass (15.35 g) was minimum when treated with 8%
aqueous extract of C. tinctorius fruit extract. The lower concentration (0.25% to 2%) of all
the studied extracts showed a hermetic response and stimulated the root, shoot and
seedling fresh weight of E. cruss-galli. The aqueous extracts inhibitory effect was in order of
leaf > fruit > stem. This study leads to conclusion that 8% or higher concentration of C.
tinctorius leaf aqueous extract may be exploited to biologically suppress the E. cruss-galli.
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September 2020
Vol. 26, Iss. 3
