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A field experiment was conducted during two consecutive summer season of 2021-2022 at the Regional Research Station (RRSS), BCKV, Raghunathpur, Purulia, West Bengal, to evaluate the efficacy of Atrazine in suppressing weed growth, improving maize crop growth and yield, and to determine the optimum application dose for effective weed management in the Red and Laterite Zone. The study included seven treatments with Atrazine 50% Wettable Powder (WP) applied at different rates: 1.0 kg ha⁻¹ (T₁), 1.5 kg ha⁻¹ (T₂), 2.0 kg ha⁻¹ (T₃), 1.0 kg ha⁻¹ (T₄ - Market sample), 2.0 kg ha⁻¹ (T₅ - Market sample), weed-free check at 20 and 40 days after sowing (DAS) (T₆), and control (T₇), along with Atrazine 50% WP (Rainbow) @4.0 kg ha^-1 for phytotoxicity observation. The weed complex included Echinochloa colona, Echinochloa formosensis, Digitaria sanguinalis, Eleusine indica, and Brachiaria mutica. The highest grain yield (4.45 t ha^-1) was recorded in the two-hand weeding treatment. Among herbicide treatments, the lowest weed population was observed in plots treated with Atrazine 50% WP (Rainbow) @ 2 .0 kg ha^-1 and market sample @2.0 kg ha^-1, which also observed the lowest weed dry weight. No phytotoxicity symptoms were observed at any applied dose of Atrazine 50% WP (Rainbow) during experimentation.

Keywords: Maize, Atrazine, Weed, Atrataf, Yield.