Weed control efficiency, weed index and yield ingroundnut as influenced by weed managementpractices under rice-groundnut system in coastalzone of Karnataka

Abstract

The field experiment was conducted at the Agricultural ResearchStation, Kumta, Uttar Kannada, University of Agricultural Sciences,Dharwad (Karnataka) during rabi-summer 2016-17 under coastal zoneto evaluate the weed management practices for weed control efficiency,weed index and yield of groundnut. Among the weed managementpractices, At harvest, significantly higher weed management efficiency(71.1 %) was observed with Two hand weeding (At 20 and 40 DAS)which was on par with T4: Pendimethalin 30 % EC @ 1.5 kg ha-1followed by One hand weeding at 25 DAS, T7: Pendimethalin 30 %EC @ 1.5 kgha-1 followed by imazethapyr 10 % SL @ 75 g ha-1 at 20-30 DAS and T9: Pendimethalin 30 % EC @ 1.0 kg ha-1 followed byOne hand weeding at 25 DAS. Lowest weed index (6.4 %) wasrecorded with the treatments where pre-emergence application ofpendimethalin 30 % EC @ 1.5 kg ha-1 followed by one hand weedingat 25 DAS. Higher pod yield (2255 kg ha-1) and kernel yield (1294 kgha-1) was recorded with the treatment where Pendimethalin 30 % EC@ 1.5 kg ha-1 followed by one hand weeding at 25 DAS, whereas, un-weeded check treatment recorded significantly lower pod yield (1453kg ha-1) and kernel yield (777 kg ha-1) than all other treatment