Weed persistence, crop resistance and phytotonic effects of herbicides in hybrid maize (Zea mays L.)

Abstract

Results of experiment conducted during Kharif season of 2016 at Research Station, OUAT, Bhubaneswar with eight different treatments of herbicides and combinations on yield of hybrid maize revealed that Weed persistence index at all the stages of crop growth that the hand weeding treatment gave the higher persistence index, indicating resistance of escaped weeds to control measures. Crop resistance index were maximum in hand weeding treatments at 20 and 40 DAS followed by atrazine @ 1.0 kg ha at 1 DAS as pre-emergence and tembotrione @ 120 g/ha at 25 DAS (POE) consistently increased the crop resistance at all the crop developmental stages of the crop. Atrazine @ 750 g/ha+ pendimethalin @ 750 g/ha as pre-emergence at 1 DAS recorded higher values of weed management index of 0.63 and 0.65 at 50 and 75 DAS, respectively compared with other weed management treatments. The same treatment also enhanced the agronomic weed management index and integrated weed management index.