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Evaluation of different herbicides against weeds and uptake pattern of potassium by rice (Oryza sativa L) under hill zone of West Bengal Mukherjee Dhiman# Directorate of Research, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, 741235, West Bengal, India #Email for correspondence: dhiman_mukherjee@yahoo.co.in
Online published on 27 April, 2018. Abstract Field and laboratory investigations were conducted at the Regional Research Station (Hill Zone), Uttar Banga Krishi Viswavidyalaya, Kalimpong (situated at 1250 m amsl) during the kharif seasons of 2013 and 2014 to find the effect of herbicides on weeds and uptake pattern of potassium by rice. The study revealed that application of metsulfuron methyl (MSM) (7.5 g/ha) + chlorimuron ethyl (CME) (7.5 g/ha) + 2, 4-D (500 g/ha) significantly reduced weed population (79.23%) and their dry weight (80.31%) over weedy check and it resulted in less potassium depletion by weeds. Combined application of MSM (7.5 g/ha) + CME (7.5 g/ha) + 2, 4-D (500 g/ha) showed significant response in potassium uptake by grain and straw and total uptake by rice crop. The significant effect of uptake was reflected in terms of higher grain yield (58.37 q/ha) which was at par with hand weeding thrice which had maximum grain yield (59.30 q/ha) and gave highest net return (Rs 46392) and benefit-cost ratio (2.97). The increase in grain yield was 85.5 per cent over unweeded check. Top Keywords Herbicides, rice, weeds, yield, potassium. Top | |
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