Field investigations were conducted at CCS Haryana Agricultural University. Hisar during rainy seasons of 1991 and 1992. Application of atrazine at 0.25 or 0.50 kg/ha at 7 or 14 DAS proved either equally or more effective than its pre-emcrgcnce application against most competitive and aggrcssive weeds likc carpctweed (Trianthema ponulacastrum), barnyard grass (Echinochloa colonum) and Kondhra (Digera arvensls). Consequently beller dry mailer production of maize was recorded with atrazine applied at 7 or 14 DAS. Atrazine application at 21 DAS failed to combate above weeds satisfactorily. Pre- and post-emergence mctrihuzin proved slightly toxic to maize seedlings.
