Effect of weed management methods on agronomic traits, yield and yield components of Neda and aerobic rice cultivars under seeding and transplanting methods
The present study was conducted in 2018 at research farm of Dashte-Naz, Sari to evaluate the effect of weed management methods on yield and yield components of Aerobic and Neda cultivars of rice under seeding and transplanting conditions. This experiment was conducted as combined analysis in places with three replications. The factors included planting method (seeding, transplanting), genotype including aerobic line and Neda and weed management (as the place) including 1-hand weeding (weed-free), 2-control (weed-infested), 3-bispyribac sodium, 4-pendimethalin, 5-traifamone, 6-bispyribac sodium+pendimethalin and 7-triafamone+pendimethalin. The results showed that the highest number of fertile tillers compared to control was associated with the hand weeding treatment and panicle length in the aerobic genotype was higher compared to Neda. The most filled grain number was obtained in hand weeding under seeding conditions followed by bispyribacsodium+pendimethalin and triafamone+pendimethalin. The amount of empty grains were higher under transplanting method compared to seeding. Also, the highest yield in both Neda and the aerobic genotype was observed in hand weeding followed by bispyribacsodium+pendimethalin and triafamone+pendimethalin. Considering labor costs and time consuming nature of hand weeding, applying the combination of the studied herbicides is recommended to improve agronomic traits of rice.
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