Weed growth and productivity of black rice cultivars as influenced by Integrated weed management in Nagaland condition
DOI:
https://doi.org/10.59797/ija.v70i2.5896Abstract
ABTRACT
A field investigation was carried out during kharif season of 2021 and 2022 at experimental site of School of Agricultural Sciences (SAS) Nagaland University, Medziphema. Main plot comprised of four integrated weed management namely W1- Weedy check (Control), W2- Hand weeding (15 and 30 DAS), W3- Pretilachlor @ 1.0 kg/ha (PE) fb HW at 40 DAS and W4- Pretilachlor @ 1.0 kg/ha (PE) + Bispyribac sodium @ 25g/ha (PoE) at 20 DAS while four cultivars viz. C1-Chakhao Poireiton (Check), C2- Chakhao Amubi, C3- Wairi Chakhao and C4- Khurukhul Chakhao under sub-plot and was laid out in Split plot design (SPD). 11 different species of grasses, sedges and broad-leaved weeds was recorded from experimental field. At 60 DAS two hand weeding at 15 and 30 DAS recorded the lowest density and biomass of grasses, sedges and broad-leaved weed which was closely followed with application of pretilachlor @ 1.0 kg/ha (PE) fb HW at 40 DAS. Chakhao Poireiton and Wairi Chakhao among the cultivars recorded the lowest weed density and biomass respectively. Highest weed control efficiency was revealed with two hand weeding at 15 and 30 DAS. Weedy check (Control) recorded lowest growth, yield attributes and yield while maximum result were exhibited with two hand weeding at 15 and 30 DAS and was closely with application of pretilachlor @ 1.0 kg/ha (PE) fb HW at 40 DAS. Among cultivars, Chakhao Poireiton and Wairi Chakhao recorded highest and lowest growth, yield attributes and yield respectively.
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