Author(s): S. K. DAS, P. NANDY AND S. SAMUI

Abstract: Over the course of two consecutive years, field experiments were carried out at the 'C' block unit farm of Bidhan Chandra Krishi Viswavidyalaya, located in Kalyani, West Bengal, India, during kharif season of 2017 and 2018. The objective was to devise an efficient and eco-friendly chemical weed management approach using novel herbicidal compounds for rice cultivation. The experiment followed a complretely randomized block design comprising eight different treatments: T1: Oxyfluorfen 23.5%EC @ 650 ml ha-1, T2: Oxyfluorfen 23.5%EC @ 1000 ml ha-1, T3: Butachlor 50%EC @ 1.25 kg ha-1, T4: Anilophos 30%EC @ 0.4 kg ha-1, T5: Pyrazosulfuron ethyl 10%WP @ 150 g ha-1, T6: Untreated control (weedy check), T7: Untreated control (weed free check), and T8: Oxyfluorfen 23.5%EC @ 2000 ml ha-1 for phytotoxicity study, in three replications. Yellow sarson was sown as follow up crop after direct seeded kharif rice to investigate the residual effects of various weed control methods implemented during the rice cultivation. Experimental result indicated that the highest rice grain yield was achieved from T7 treatment i.e., weed free check and lowest from T6 treatment i.e., weedy check plot. It was also found that impacts of various herbicides on rice grain yield were significant over T6. Among the chemical treatment, T2 (Oxyfluorfen 23.5% EC @ 1000 ml ha-1) recorded with maximum rice grain yield. The lowest weed dry weight and weed density were recorded for T7 (weed free check) treatment followed by Oxyfluorfen 23.5%EC @ 2000 ml ha-1 (T8) treated plot at all stages of observations taken. Application of Oxyfluorfen 23.5%EC @ 2000 ml ha-1 observed slightly better weed control efficiency in rice than applied @ 1000 ml ha-1, but reduction in grain yield was found at greater concentration of Oxyfluorfen due to adverse impact on plant growth which reflected in yield contributing characters and yield. Maximum microbial population (bacteria, fungi and actinomycetes) was found at T7 treatment at all stages of experiment, though it turned non-significant at 60 DAA. Effect of various chemical herbicides applied in kharif rice was non-significant on germination, growth and yield of yellow sarson. No phytotoxic effect was found both on rice and yellow sarson due to application of chemical herbicides even in higher doses.

DOI: 10.22271/09746315.2024.v20.i1.1760

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