Vol. 15 No. 1
Effect of herbicides on weed dynamics, phytotoxicity and seed yield of linseed (Linum usitatissimum L.)
Author(s): C. S. PUHUP AND S. K. DWIVEDI
Abstract: A field experiment was conducted during rabi season of 2016-17 and 2017-18 at Research cum Instructional Farm of Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh. The treatment was comprised i.e. metribuzin + oxyflurofen @ 250 g a.i.+ 125 g a.i. ha-1 as pre-emergence (T1), oxyflurofen @125 g a.i.ha-1 as pre-emergence (T2), oxadiargyl @ 80 g a.i. ha-1 as pre-emergence (T3), imazethapyr 10 EC @ 75 g a.i. ha-1 as post-emergence (T4), metsulfuron-methyl @ 4 g a.i. ha-1 as postemergence (T5), isoproturon @ 1 kg a.i. ha-1 as post-emergence (T6), isoproturon + metsulfuron-methyl @ 1 kg a.i. + 4 g a.i. ha-1 as post-emergence (T7), pendimethalin + fb metsulfuron-methyl @ 1 kg a.i.+ fb 4 g a.i. ha-1 as pre + post-emergence (T8), hand weeding twice 21 and 45 DAS (T9) and weedy check (T10). The experiment was laid out in RBD and thrice replicated with the variety of ‘RLC-92’. The lowest weed density of total weeds and dry matter of weeds were observed with hand weeding treatment, however among herbicide treatment, application of isoproturon + metsulfuron-methyl @ 1 kg a.i.+ 4 g a.i. ha-1 as post-emergence (T7) was found lowest density of total weeds and dry matter at 60, 90 DAS and at harvest stages. The treatments of imazethapyr 10 EC @ 75 g ha-1 as post-emergence (T4) and pendimethalin + fb metsulfuron-methyl @ 1 kg a.i.+ fb 4 g a.i. ha-1 as pre + postemergence (T8) was found phytotoxic on linseed. The seed yield of linseed was recorded highest with hand weeding treatment (1940 kg ha-1) however, application of isoproturon + metsulfuron-methyl @ 1 kg + 4 g ha-1 as post-emergence (T7), metsulfuronmethyl @ 4 g a.i. ha-1 as post-emergence (T5), pendimethalin + fb metsulfuron-methyl @ 1 kg a.i. + fb 4 g a.i. ha-1 as pre + postemergence (T8) and isoproturon @ 1 kg a.i. ha-1 as post-emergence (T6) were found statistically at par. In case of economical analysis, the application of metsulfuron-methyl @ 4 g a.i. ha-1 as post-emergence (T5) was found highest value (3.91). Hence, sole application of metsulfuron-methyl @ 4 g a.i. ha-1 as post-emergence (T5) was most effective herbicide against broad leaf of weed flora i.e. Medicago dendiculata.
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