Effect of Chemical Herbicides on Diversified Weed Flora and Weed Control Efficiency in Maize (Zea mays L.)

The field experiment was carried out at Agriculture Research Farm, Integral University, Lucknow, Uttar Pradesh, India during Kharif, 2021. The experiment envisages study the effect of herbicides on the density, index and control efficiency of weed on maize crop. The experiment was laid down in the Randomized block design with twelve treatments replicated thrice. The highest weed control efficiency was observed in weed free treatment (T11) due to weed free environment all over the maize growth period but among the herbicidal treatments the treatment (T1) Atrazine 1.0 kg a.i ha-1 PE (Pre-emergence) showed highest weed control efficiency of 67.69 % up to 20 DAS. The treatment (T8) Atrazine 0.5 kg a.i ha-1 PE followed by Tembotrione 0.120 kg a.i ha-1 PoE at 20 DAS resulted in the lowest weed count and lowest weed index of 5.59 sqm-1 and 7.62% respectively. The highest weed control efficiency of 79.78 % all over the crop growth period was observed in the treatment (T8) Atrazine 0.5 kg a.i ha-1 PE followed by Tembotrione 0.120 kg a.i ha-1 PoE. The treatment Weedy check (T12) recorded highest weed dry matter accumulation while among the herbicidal treatments the lowest weed dry matter accumulation was observed in T8 treatment and was at par with the treatment T7.