Weeds have been a problem creator in crops since time immemorial competing with them for all the growth resources. Weeds cause around 28-100% loss in the maize crop which necessitates their control. The usage of herbicides for the control of weeds has been the most prominent method among farmers. However, the continuous usage of similar herbicides can develop herbicide resistance which needs the exploration to newer herbicides. Therefore, a field experiment was carried out to assess the effect of broad-spectrum herbicide, mesotrione on the weed flora and seed yield of maize at JNKVV, Jabalpur (M.P.) in the kharif season of 2019. The experiment was carried out in randomised block design consisting of eight treatments of weed control including six herbicidal treatments with hand weeding and weedy check and replicated thrice. Based on the results, it was concluded that the post emergence application of mesotrione 350 g ha-1 at 30 DAS had most effectively controlled the weeds resulting in highest weed control efficiency (69.25%) and lowest weed index (12.62%) than the rest of the treatments. It also resulted in highest grain and stover yield (2.44 and 21.80 t ha-1) in maize. Thus, the application of mesotrione @ 350 g ha-1 can be a promising technology for the control of complex weed flora in maize.
Newer herbicides are required to reduce the losses cause by the weeds in maize crop. Therefore, a field experiment was conducted during kharif 2019 at Research Farm, AICRP on Forage Crops, Department of Agronomy, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur (Madhya Pradesh) to study the effect of different weed management practices on productivity of Maize (Zea mays L.). The experiment was conducted in randomized block design with eight treatments (six herbicidal treatments with hand weeding twice at 20 and 40 DAS and weedy check) replicated thrice. Observations were recorded for various weed parameters and crop growth parameters. All the weed management treatments significantly reduced the total weed density and total dry weight of weeds as compared to weedy check. Among herbicidal treatments, mesotrione 350 g ha-1 recorded the lowest total weed density and total dry weight of weeds as compared to other herbicides. While highest total weed density and total dry weight were recorded under weedy check treatment. Significantly higher growth parameters and yield attributing traits were recorded with the application of mesotrione 350 g ha-1 which resulted in higher grain and stover yields (2447.22 and 21804.72 kg ha-1) followed by mesotrione 300 g ha-1. Maximum net returns and Benefit: Cost ratio was also obtained with the application of mesotrione 350 g ha-1.
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