Effect of integrated weed management on weed growth and yield of onion

A field experiment was carried out during Rabi, 2024-2025 at the Vegetable Research Farm, Chaudhary Sarwan Kumar Himachal Pradesh Krishi Vishvavidyalaya, Palampur. The objective of the study was to identify integrated weed management option to manage weeds and attain higher onion yield. There were twelve treatments, replicated thrice in randomized block design. The major weed flora associated with onion were: Poa annua (37.31%) followed by Coronopus didymus (16.55%), miscellaneous weeds (15.76%), Euphorbia sp. (11.94%), Capsella bursa-pastoris (9.34%) and Gallinsoga parviflora (9.1%). The weed free, pre-emergence application (PE) of pendimethalin 1.0 kg/ha followed by (fb) hand weeding (HW) twice at 45 and 70 days after transplanting (DAT) onion and post-emergence application (PoE) of oxyfluorfen 0.15 kg/ha fb HW twice at 45 and 70 DAT, efficiently reduced the density and biomass of different weed species with higher highest weed control efficiency at 90 DAT. It is concluded that effective and economical weed management and higher onion yield can be obtained with pendimethalin 1.0 kg/ha PE fb HW twice at 45 and 70 DAT.