@article{Paudel_Shrestha_Amgain_Neupane_2017, title={Weed Dynamics in Various Cultivars of Rice (Oryza sativa L.) under Direct Seeding and Transplanting Conditions in Lamjung}, volume={5}, url={https://www.nepjol.info/index.php/IJASBT/article/view/17611}, DOI={10.3126/ijasbt.v5i2.17611}, abstractNote={<p>Even though rice is a major crop of Nepal, its’ productivity seems very low in South Asia due to high infestation of weeds. Therefore, a field research was conducted in the field of Lamjung Campus, Sundarbazar from July-October, 2015. Two Factorial Randomized Complete Block Design under direct seeding (DSR) and transplanted (TPR) cultivations with weeded and non-weeded check for diverse rice cultivars (US-382, Sukha-2, NR-10676, NR-10490 and Khumal-10) as treatments was executed in field with 3 replications. Statistical results indicated that <em>Rotataindica, Fimbristylis miliacea, Ageratum conyzoides, Cyperusiria, Polygonum barbatum and Cynadon dactylon</em> were found as the major weeds under both DSR and TPR whereas <em>Paspalum distichum </em>L., <em>Alternanthera sessiles </em>L., <em>Echinochloa colona</em> L., <em>Digitaria</em>sp., <em>Amischophacelus axillaris</em> L., <em>Echinochloa crusgalli</em> L. were minor. <em>Rotataindica</em> was found the major weed in TPR. It was seemed that the highest weed population recorded for US-382(131.7/m<sup>2</sup>),when cultivated under TPR system but it was completely absent under DSR. Meanwhile <em>Cynadon dactylon</em> was completely absent in weeded region of TPR system, which in contrary was the highest in weeded field of DSR with variety US-382(18.7/m<sup>2</sup>). Similar results were found in case of biomass for varieties consisting higher number of weeds while it was lowest in weeded field of NR-10490 shown as TPR. Highest grain yield was obtain from the weeded region of US-382(7.7 t/ha) of TPR system whereas lowest yield was found in varieties NR-10490 and NR-10676 (1.8 t/ha) of non-weeded region of DSR system. With the increase in biomass of weed the yield of rice decrease gradually with co-relation, y = -0.0119x + (R² = 0.1251). Hence, without effective weed control management we can’t increase the productivity of rice.</p><p><em>Int. J. Appl. Sci. Biotechnol. Vol 5(2): 159-167</em></p>}, number={2}, journal={International Journal of Applied Sciences and Biotechnology}, author={Paudel, Basu and Shrestha, Abhisek and Amgain, Lal Prasad and Neupane, Madhav Prasad Neupane}, year={2017}, month={Jun.}, pages={159–167} }