UNDERGRADUATE

Permanent URI for this collection

Now showing 1 - 1 of 1

Competitive ability of creeping water primrose (Ludwigia adscendens (L.) H. Hara) in direct seeded rice ( oryza sativa L.) at different density levels [manuscript]
(2020) Adamson L. Agat; TBD Supervisor
An experiment was conducted to determine the competitive ability of the seeding rate of rice planted together with various densities of Ludwiga adscendens and to determine the yield loss of rice due to infestation of L. adscendens. Seeding rate with 30, 60 and 90 pre germinated rice (NSIC Rc 222) were planted together with 0, 5, 10 and 15 density of L. adscendens. Results of the study showed that plant height, number of tillers, leaves, panicles, biomass of L. adscendens, unfilled grains, percent filled grain, number of grains and 1000 grain weight were not significantly affected by the interaction of seeding rate and density of weeds. Seeding rate alone significantly affects the height, number of tillers, and leaves of rice. In yield components, the number of panicles, total number of grains, filled and unfilled grains were also reduced as the seeding rate increases. On the other hand, differently density levels of weed alone reduced the plant height, number of tillers and leaves, number of panicles, filled grains and percent filled grain, significantly. Percent yield loss showed no significant differences at different weed density levels but percent yield loss were recorded from 11.23% (10 densities to 17.82% (15 densities).