Studies on weed control in irrigated groundnut.
In field trials in irrigated groundnuts during kharif season, effective control of weeds was achieved with 0.72 kg fluchloralin or 0.75 kg pendimethalin/ha, or at half these rates with handweeding. Oxadiazon at 0.5 kg/ha pre-em. did not satisfactorily control Diodia teres. Bentazone at 1.0 kg applied 6 weeks after sowing gave poor control of Eragrostis sp., D. teres and Eleusine aegyptiaca, and moderate control of Commelina benghalensis and Cyperus compressus. Pod yields >1.5 t/ha were obtained using 0.5 kg oxadiazon pre-em. followed by handweeding 6 weeks after sowing, or handweeding at 3 and 6 weeks after sowing followed by 1.0 kg bentazone applied 8 weeks after sowing. In 1981, oxadiazon at 0.5 kg pre-em. increased yields by 45.8% over the control. The herbicide efficiency index (percentage yield increase:percentage weed wt) was positive for all herbicides tested.