Efficacy of various herbicides for weed control in wheat (Triticum aestivum) intercropped with autumn sugarcane (Saccharum officinarum) under sub-mountaineous conditions of Punjab

摘要

A field experiment was conducted during the winter (rabi) season of 2011-12 and 2012-13 at Gurdaspur, Punjab, to assess the efficacy of various herbicides for weed control in wheat (Triticum aestivum L.) intercropped in autumn planted sugarcane. The experiment comprising 8 treatments was laid out in a randomized block design with 3 replications. Among herbicidal treatments, sulfosulfuron + metsulfuron 75 wg @ 0.03 kg/ha was found to be significantly superior to the application of clodinafop 15 wp @ 0.06kg/ha, fenoxaprop-p-ethyl 10 ec @ 0.1 kg/ha, isoproturon 75 wp @ 0.94 kg/ha and metribuzin 70 WP @ 0.26 kg/ha in reducing the biomass of weeds, but at par with sulfosulfuron.75 wg @ 0.02 kg/ha. Sulfosulfuron + metsulfuron 75 wg @ 0.03 kg/ha resulted in20.5, 17.5, 42.4 and 23.7% increase in wheat grain yield; 5.3, 4.7, 6.6 and 4.9% increase in cane yield; and 8.5, 7.0, 12.8 and 8.7% increase in cane-equivalent yield over clodinafop 15 wp @ 0.06 kg/ha, fenoxaprop-p-ethyl 10 ec @ 0.1 kg/ ha, isoproturon75 wp @ 0.94 kg/ha and metribuzin 70 wp @ 0.26 kg/ha respectively. Significantly higher effective tillers/m2and number of grains/ear were recorded with sulfosulfuron + metsulfuron 75 wg @ 0.03 kg/ha over the application of clodinafop 15 wp @ 0.06 kg/ha,fenoxaprop-p-ethyl 10 ec @ 0.1 kg/ha, isoproturon 75 wp @ 0.94 kg/ ha and metribuzin 70 wp @ 0.26 kg/ha. The highest weed-control efficiency (87.8%) and benefit: cost ratio (1.59) were found under sulfosulfuron + metsulfuron 75 wg @ 0.03 kg/ha-treated plots, closely followed by sulfosulfuron 75 wg @ 0.02 kg/ha and mesosulfuron + iodosulfuron 3.6 wdg @ 0.01 g/ha.