S. Senthil Kumar, G. Murugan and M. Saravana Perumal
Abstract
A field experiment was carried out in the Experimental Farm, Department of Agronomy, Faculty of Agriculture, Annamalai University, Annamalai Nagar, Tamil Nadu, India during January to June to enumerate the weed management practices on weed indices on the productivity of irrigated cotton (Gossypium hirsutum L.). The experimental was laid out in Randomized Block Design (RBD) comprised of eight treatments and three replications. The treatments are T1 - Unweeded control, T2 â Twice hand weeding on 20 and 45 DAS, T3 â Power tiller weeding on 20 and 45 DAS, T4 â Calatropis gigantea leaf extract @10% + One hand weeding on 45 DAS, T5 â Calatropis gigantea leaf extract@20% + Power tiller weeding on 45 DAS, T6 â Pendimethalin (3.3 lha-1) PE on 3 DAS + One hand weeding on 45 DAS, T7 â Pendimethalin (3.3 lha-1) PE on 3 DAS + Power tiller weeding on 45 DAS, T8 â pendimethalin (3.3 lha-1) PE on 3 DAS + Pyrithiobac sodium 62.5 gha-1 on 45 DAS as PoE. From the results, it was revealed that (T3- Power tiller weeding on 20 and 45 DAS) which helps in decreasing different weed population and diminishing the weed biomass which increases the yield attributes. It also recorded the higher weed control efficiency (WCE), weed control index (WCI) and crop resistance index (CRI).