The Influence of Different Post-emergence Herbicide Mixtures on the Physiological Traits and Yield of Irrigated Wheat (Triticum aestivum L.). in Madhya Pradesh, India

The present investigation was conducted during the rabi season of 2022-23 and 2023-24 at the agronomy research farm of Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior (M.P.). The experiment was carried out in a Randomized block design with eight treatments and three replications. The values of LAI, CGR and AGR were increasing up to 90 DAS and RGR upto 60 DAS growth stage and then declined upto maturity. Among the weed control treatments, the highest values of LAI, CGR, RGR and AGR were recorded under weed free plot which was followed by post-emergence application of Pyroxasulfone 85% WG + Metsulfurone 20% WG @ 127.5 + 4 g/ha and post-emergence application Metsulfurone Methyl 20% WP @ 4 g/ha + Clodinafop propargyl 15 WP @ 60 g/ha at almost all the crop growth stage. The results indicated that the combined application of post-emergence Pyroxasulfone 85% WG + Metsulfurone 20% WG @ 127.5 + 4 g/ha significantly enhanced plant height, leaf area and dry matter production, followed by the post-emergence application of Metsulfurone Methyl 20% WP @ 4 g/ha + Clodinafop Propargyl 15 WP @ 60 g/ha. These treatments performed better than the control and were statistically comparable to the weed-free plot.

The highest grain yield, straw yield and harvest index was recorded in the weed-free plot, while the lowest yield was observed in the weedy check plot. However, the combined application of Pyroxasulfone 85% WG + Metsulfurone 20% WG @ 127.5 + 4 g/ha resulted in grain yield, straw yield and harvest index statistically similar to the weed-free plot, demonstrating its effectiveness in controlling weeds and enhancing crop productivity.