Growth, Yield and Economics as Influenced by Integrated Weed Management and Cultivars of Black Rice under Nagaland Condition

An experimental investigation was conducted during the kharif season of 2021 and 2022 at the experimental site of the School of Agricultural Sciences (SAS), Nagaland University, Medziphema. The main plot included four integrated weed management measures, namely Weedy check (control), Hand weeding (15 and 30 DAS), Pretilachlor @ 1.0 kg ha-1 (PE) fb HW at 40 DAS and Pretilachlor @ 1.0 kg ha-1 (PE) + Bispyribac sodium @ 25 g ha-1 (PoE) at 20 DAS while four cultivars namely Chakhao Poireiton (Control), Chakhao Amubi, Wairi Chakhao and Khurukhul Chakhao under the sub-plot and laid out in Split plot design (SPD). At 40 DAS, both total weed population and dry weight was recorded with hand weeding at 15 and 30 DAS and was followed by the application of pretilachlor @ 1.0 kg ha-1 (PE) fb HW at 40 DAS. Among cultivars, Chakhao Poireiton and Wairi Chakhao registered lowest and highest total weed population and dry weight respectively. Weedy check (control) recorded the lowest growth, yield and economics while the maximum result was obtained with hand weeding at 15 and 30 DAS and was closely followed with application of pretilachlor @ 1.0 kg ha-1 (PE) fb HW at 40 DAS. Among the cultivars, Chakhao Poireiton and Wairi Chakhao recorded the highest and lowest growth, yield and economical studies in both the years respectively.