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An experiment was carried out at Instructional Farm, Department of Agronomy, College of Agriculture, Junagadh Agricultural University, Junagadh (Gujarat). The aim of the research is to evaluate herbicides bio-efficacy on yield, quality parameters of sweet sorghum and their residual effects on soil microbial diversity. The higher grain yield and fodder yield (kg ha-l), reducing, non-reducing sugars and total sugar in juice were recorded under weed-free plot (T9), which was statistically at par with the treatments IC & HW at 15 and 30 das (T8), PE application of atrazine 50 WP 500 g/ha fb mesotrione + atrazine 44.97 SC (premix) 875 g/ha at 30 DAS, (T7) and PE application of atrazine 50 WP 500 g/ha + IC & HW (T1). Before sowing, no significant differences in microbial population were observed. At 20 days after herbicide application, the weedy check plot (T10) had the highest microbial population, similar to weed-free and manual weeding treatments. Herbicide-treated plots had lower microbial populations. At harvest, the highest microbial population was found in atrazine 50 WP 500 g/ha (PE) followed by tembotrione 42 SC 100 g/ha (PoE) which remained statistically at par with the rest of herbicidal treatments.
Sravani et al. (Fri,) studied this question.