Impact of integrated weed management on weeds and yield of direct-seeded rice (Oryza sativa)

Abstract

A field investigation was conducted during the rainy season of 2014 and 2015 at Varanasi, Uttar Pradesh, to study the impact of integrated weed management on weeds and yield of direct-seeded rice (Oryza sativa L.). At 30, 60, 90 days after sowing (DAS) and harvesting, amongst the integrated weed-management treatments, penoxsulam 35 g/ha at 10 DAS followed by (fb) 1 hand-weeding at 35 DAS reduced the weed density of grasses, sedges and broad-leaf weeds and their dry weight than penoxsulam 35 g/ha at 20 DAS fb 1 hand-weeding at 35 DAS, thus resulting in the lowest weed index. Penoxsulam 35 g/ha at 10 DAS fb 1 hand weeding at 35 DAS exhib- ited the highest weed-control efficiency over rest of the treatments except hand-weeding at 15 and 35 DAS. Penoxsulam 35 g/ha at 10 DAS fb 1 hand-weeding at 35 DAS statistically influenced the grain and straw yields and harvest index over all other treatments except hand-weeding at 15 and 35 DAS. Also the highest net return and benefit: cost ratio were observed under penoxsulam 35g/ha at 10 DAS fb1 hand-weeding at 35 DAS.