Vol. 10, Issue 11 (2021)

Author(s):
TK Srimathi, CR Chinnamuthu, S Marimuthu and A Senthil

Abstract:
Field experiment was carried out in the Eastern Block Farms, Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore, to optimize the time and dose of newly synthesised nano encapsulated sulfentrazone herbicide formulation for weed management in irrigated groundnut during summer season of 2021. Two doses of sulfentrazone herbicides (0.30 kg ha^-1 and 0.40 kg ha^-1) with or without encapsulation applied one day before sowing, one, two and three days after sowing. The treatments were compared with absolute control, replicated thrice and laid out in randomized block design. The study revealed that the lower weed dry weight and weed control index were achieved with the plot applied with encapsulated sulfentrazone one day before sowing at the rate of 0.30 kg ha^-1 compared to control. The same treatment registered higher pod and haulm yields. Higher weed dry weight, weed density and the least pod yield was observed with the absolute control. Application of sulfentrazone at the rate of 0.40 kg ha^-1 recorded phytotoxic symptoms during the initial period of crop growth.