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Impact of herbicide application on weed flora, yield attributes and soil microbial population in Rabi maize (Zea mays L.)



Citation :- Impact of herbicide application on weed flora, yield attributes and soil microbial population in Rabi maize (Zea mays L.). Crop Res. 60: 324-329
PRIYANKA PAUL, SUNITA MEHER, ASHIRBACHAN MAHAPATRA AND SIDDHARTHA DAS sunitameher60@gmail.com
Address : M.S. Swaminathan School of Agriculture, Centurion University of Technology and Management, Paralakhemundi-761211, Odisha, India
Submitted Date : 8-07-2025
Accepted Date : 5-08-2025

Abstract

Maize plays a vital role in India’s food and livelihood security. Despite its significance, maize productivity in regions like Odisha remains moderate, partly due to severe early-season weed competition. While herbicides offer effective control, their excessive use poses serious threats to soil microbial health and long-term sustainability. Based on this, a field experiment was conducted during the Rabi season of 2024-25 at the post graduate research farm of M. S. Swaminathan School of Agriculture, Centurion University of Technology and Management, Paralakhemundi, Odisha to assess the impact of herbicide application on weed flora, yield attributes and soil microbial population in Rabi Maize. The study involved ten treatments, including pre-emergence (PE), post-emergence (PoE), and sequential applications of atrazine, mesotrione, tembotrione, and topramezone, along with hand weeding (HW) and a weedy check, which were evaluated using maize hybrid Bayer DKC-9217 in a randomised block design. The lowest weed density, weed dry matter were recorded under HW at 20 and 40 DAS, followed by atrazine + mesotrione (ready-mix) 875 g/ha PoE at 20 DAS and atrazine 1000 g/ha PE fb topramezone 30 g/ha PoE at 20 days after sowing (DAS). The weedy check showed a 54.58% yield loss. Growth parameters, yield attributes and yield were significantly highest in HW at 20 and 40 DAS and statistically comparable with the two best-performing herbicidal treatments. Atrazine + mesotrione (ready-mix) 875 g/ha PoE at 20 DAS improved soil microbial and PGPR populations, comparable to the atrazine 1000 g/ha PE fb topramezone 30 g/ha PoE at 20 DAS, suggesting both treatments as eco-friendly and sustainable weed management options for Rabi maize.

Keywords

Crop productivity grain yield herbicides maize soil microbial population weed dynamics


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