The impact of various herbicide combinations on weed flora in wheat crops in the Gird region of Madhya Pradesh

The present investigation entitled “The impact of various herbicide combinations on weed flora in wheat crops in the Gird region of Madhya Pradesh” was conducted during rabi season of 2022-23 and 2023-24 at agronomy research farm of Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior (M.P.). The soil of experiment was sandy clay loam with low aggregation, neutral in reaction (pH 7.43), low in organic carbon (0.45%), medium in available nitrogen (182 kg ha-1), medium in available phosphorus (13.5 kg ha-1) and high in available potassium (220 kg ha-1) The experiment was carried out in a Randomized block design with eight treatments and three replications. The treatment comprises of W1- Weed free (two hand weeding 30 and 45 DAS), W2- Post- Emergence application of Pyroxasulfone 85% WG @ 127.5 g/ha, W3- Post-Emergence application of Pyroxasulfone 85% WG + Metsulfurone 20% WG @ 127.5 + 4 g/ha, W4-Early Post- Emergence application of Pyroxasulfone 85% WG + Metsulfurone 20% WG @ 127.5 + 4 g/ha, W5-Post -Emergence application of Metribuzin 70% WP @ 300 g/ha, W6-Post-Emergence application of Clodinafop propargyl 9% + Metribuzin 20% WP @ 600 g/ha, W7-Post-emergence application Metsulfurone Methyl 20% WP @ 4 g/ha + Clodinafop propargyl 15 WP @ 60 g/ha and W8-Weedy check (without herbicide treatment). The highest number of individuals was recorded in both year for Cyprus rotendus (28.33 & 27.33%), Medicago denticulata (19.67% & 19.34%), Chenopodium album (18.00% & 17.00%), Phalaris minor (17.33% & 17.00%), and Convolvulus arvensis (16.34% & 15.33%). All the herbicide treatments provided significant control of weeds causing significant reduction in density of target weed flora and improved the grain yield compared with the weedy check. The highest mortality of weeds (90.15%) and higher values of growth parameters, yield attributes and maximum wheat grain yield was recorded where post-emergence application of Pyroxasulfone 85% WG + Metsulfurone 20% WG @ 127.5 + 4 g/ha was applied.