Aerobic rice, Herbicides, Weed control efficiency, Weed density

Field experiment was conducted at Agricultural College and Research Institute, Madurai during Rabi 2010-2011 to study the efficacy of new  herbicides for controlling weeds in aerobic rice.  Minimum grass, sedge, broad leaved weed and total weed density and their dry matter production and higher weed control efficiency were obtained in plots receiving post-emergence mixture of fenoxaprop + (chlorimuron + metsulfuron) on 30 DAS followed by sequential application of pre-emergence oxyfluorfen and post-emergence 2,4-D on 30 DAS and post-emergence mixture of fenoxaprop + ethoxysulfuron on 30 DAS.  The result on phyto-toxicity rating revealed that pre-emergence oxyfluorfen and post-emergence 2,4-D on 30 DAS  showed phyto-toxicity rating of 5 on 10 DAS and 4 on 20 DAS and no toxicity before harvest.  Post-emergence mixture of fenoxaprop + ethoxysulfuron on 30 DAS  recorded significantly higher grain yield of 6278 kg/ha.