Field experiment was conducted during rabi seasons of 2012-13 and 2013-14 at Agricultural Research Institute, Patna to find out the bio-efficacy of herbicides for controlling weeds in linseed in comparison to hand weeding twice at 20 and 40 days after sowing. The most predominant weed flora observed in the experimental plots were broad leaf weeds like Rumex dentatus, Chenopodium album, Polygonum plebejium, Alternenthera sesilis, Physalis minima, Medicago polymorpha and Solanum xanthocarpum, grasses likeCynodon dactylon, Digitaria sanguinalis and sedges like Cyperus rotundus. The herbicide treatments include pre-emergence application of pendimethalin @ 1000 g a. i./ha, pendimethalin 30 EC + imazethapyr 2 EC @ 750 and 1000 g a. i./ha and post-emergenceapplication of isoproturon 75 WP@ 1000 g a. i./ha, clodinafop 15 WP@60ga. i./ha and imazethapyr 10 SL@40, 60, 75 and 100 g a. i./ha. The results showed that application of pendimethalin 30 EC + imazethapyr 2 EC @ 750 and 1000 g a. i./ha as pre-emergenceshowed inhibitory effect on the linseed seedlings. Safe herbicide pendimethalin 30 EC @ 1000 g a. i./harecorded lowest weed biomass with highest weed control efficacy (91.5) which was at par with isoproturon 75 WP@ 1000 g a. i./ha as post-emergence withweed control efficacy of 89.9. The manually weeded plot recorded the highest seed yield of 1337 kg/ha among all the treatments, whereas maximum seed yield among the herbicide treatments was obtained with post-emergence application of isoproturon 75 WP@1000 g a. i./ha (1195 kg/ha), which was found statistically at par with pre-emergence application of pendimethalin 30 EC @ 1000 g a. i./ha (1177 kg/ ha), post-emergence application of imazethapyr 10 SL@ 60 ga. i./ha (1110 kg/ha) and with manually hand weeding twice. In terms of profitability, post-emergence application of isoproturon 75 WP@ 1000 g a. i./ha gave the highest net returns, B : C ratio and incremental B : C ratio than all other weed control treatments.
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机译：在2012-13年和2013-14年的拉比季节，在巴特那农业研究所进行了田间试验，以了解除草剂控制亚麻籽杂草的生物功效，与播种后20天和40天的人工除草相比。在试验地块中观察到的最主要杂草区系是阔叶杂草，如Rumex dentatus，Chenopodium album，Polygonum plebejium，Alternenthera sesilis，Physalis minima，Medicago polymorpha和Solanum xanthocarpum，禾本科草，如Cynodon dactylon，Digitaria sanguinalis和莎草，如Cyperus rotundus。除草剂处理包括出苗前施用二甲戊灵@ 1000 g a.i./ha、戊二甲灵30 EC + imazethapyr 2 EC @ 750和1000 g a. i./ha，以及出苗后施用异丙隆75 WP@1000 g a.i./ha，氯地那福15 WP@60ga。I./ha和Imazethapyr 10 SL@40、60、75和100 g a.i./ha。结果表明，出苗前施用二甲戊灵30 EC + imazethapyr 2 EC @ 750和1000 g a. i./ha对亚麻籽幼苗有抑制作用。安全除草剂二甲戊灵 30 EC @ 1000 g a. i./ha记录的杂草生物量最低，杂草控制效果最高（91.5%），与异丙隆 75 WP@ 1000 g a. i./ha 相当，出苗后杂草控制效率为 89.9%。在所有处理中，人工除草地块的种子产量最高，为1337 kg/ha，而除草剂处理中除草剂产量最高的是出苗后施用异丙草素75 WP@1000 g a. i./ha （1195 kg/ha），在统计学上发现，这与出苗前施用的二甲戊灵30 EC @ 1000 g a. i./ha （1177 kg/ha）相当， 出苗后施用 Imazethapyr 10 SL@ 60 ga. i./ha （1110 kg/ha），并人工除草两次。在获利能力方面，出苗后施用异丙隆75 WP@1000 g a. i./ha的净收益、B：C比和增量B：C比均高于其他所有杂草防治处理。
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