Nandal, D.P.Walizada, Abdul Wahab2019-05-282019-05-282018http://krishikosh.egranth.ac.in/handle/1/5810104917A field experiment entitled “Bio-efficacy of herbicides and their mixtures on broad leaf weeds in wheat” was conducted during Rabi 2016-17 at Agronomy Research Farm of CCS Haryana Agricultural University, Hisar. The experiment comprised of five post emergence herbicides (metsulfuron, carfentrazone, 2, 4-D Ester, pyroxsulam and halauxifen) and their mixtures at different doses. The weedy check and weed free treatment was also taken for further clarification of the effects of the herbicides and their mixtures in wheat. All the treatments were applied at 35 days after sowing of the crop. The experiment was laid in randomized block design with three replications. Plant population was not affected by any treatment. However, application of the herbicides halauxifen + pyroxsulam at 23.96 g/ha, metsulfuron + 2, 4-D Ester at (3 + 500 g/ha) and halauxifen + pyroxsulam at 19.17 g/ha at 60, 90 and 120 days after sowing and at harvest significantly increased the plant height. Halauxifen + pyroxsulam at 19.17 and 23.96 g/ha resulted into least phytotoxicity up to 15 days after treatment as compared to all other herbicides and their mixtures. Both the herbicide mixtures i.e. halauxifen + pyroxsulam at 23.96 g/ha and metsulfuron + 2, 4-D Ester at 3 + 500 g/ha consistently resulted into higher dry matter accumulation at all the intervals as compared to weedy check at 60, 90, 120 and at harvest, respectively. Application of halauxifen + pyroxsulam at 23.96 kg/ha, metsulfuron + 2, 4-D Ester at 3 + 500 g/ha and carfentrazone + 2, 4-D Ester at 15 + 500 g/ha resulted into higher number of tillers per meter row length. Likewise, leaf area index was also found higher in halauxifen + pyroxsulam at 23.96 g/ha at 60, 90, 120 days after sowing and at harvest. Based on the above findings, it could be concluded that application of halauxifen + pyroxsulam sprayed at 23.96 g/ha at 35 days after sowing was the most economical treatment to control the weeds in wheat with higher grain yield of 5395 kg/ha, straw yield of 8466 kg/ha and biological yield of 13861 kg/ha with highest weed control efficiency followed by metsulfuron + 2, 4-D Ester at 3 + 500 g/ha and carfentrazone + 2, 4-D Ester at 15 + 500 g/ha.ennullThesis