Nutrient uptake by rice and weeds as influenced by different weed management practices in dry-seeded rice

Among the herbicides, application of orthosulfamuron 100 g/ha was effective in suppressing sedges and broad-leaved weeds, metsulfuron-methyl + chlorimuron-ethyl 4 g/ha was effective in suppressing broad-leaved weeds and sequential application of pendimethalin 0.75 kg/ha at 3–5 DAS fb metsulfuron-methyl + chlorimuron-ethyl 4 g/ha at 20–25 DAS performed better in controlling weeds resulting in higher weed control efficiency and lower weed index when compared to alone application of herbicides either as pre-emergence and post-emergence. Pre-emergence application of pendimethalin 0.75 kg/ha at 3–5 DAS fb metsulfuronmethyl + chlorimuron-ethyl 4 g/ha as post-emergence at 20–25 DAS, was evidenced higher grain yield and higher uptake of nutrients in crops and lower uptake of nutrients i.e., N, P and K in weeds