Evaluation of New Generation Herbicide-based Weed Management Strategies on Direct Sown Rice Production in Cauvery Deltaic Zone

Abstract

Field assay was conducted during “Navarai” season, 2019 at Chidambaram region of cauvery delta to find out the influence of new generation herbicide based weed management in direct sown rice production. The Experiment was laid out in randomized block design with three replications using rice cultivar CO-51. The treatments includes T1- Un-weeded check, T2- Twice hand weeding at 15 and 30 DAS T3- Pre-emergence application of pyrazosulfuron-ethyl 10% WP at 200g ha-1 at 7 DAS + one Hand weeding at 30 DAS T4- Pre-emergence application of metsulfuran-methyl 10% + chlorimuron-methyl 10% WP at 20g ha-1 at 7 DAS + one Hand weeding at 30 DAS T5-Pre-emergence application of Pretilachlor 50% EC at 1250 ml ha-1 at 7 DAS + one Hand weeding at 30 DAS T6- Early post-emergence application of pretilachlor 6% + pyrazosulfuran-ethyl 0.15% G at 615g ha-1 at 15 DAS. T7- Early post-emergence application of bispyribac-sodium 10% SC at 300 ml ha-1 15 DAS T8- Early post-emergence application of pretilachlor 6% + pyrazosulfuran-ethyl 0.15% G at 615g ha-1 at 15 DAS + one Hand weeding at 30 DAS T9- Early post-emergence application of bispyribac-sodium 10% SC at 300 ml ha-1 at 15 DAS+ one Hand weeding at 30 DAS. On analysing the experimental results, it is revealed that all the imputed treatments has affected weed flora, crop growth, yield attributes and economics of direct sown rice cultivation. Furthermore, application of bispyribac-sodium 10% SC at 300 ml ha-1 at 15 DAS + one hand weeding at 30 DAS provided superior results amid all the treatments. The absence of weed management practices (i.e) T1- Un-weeded check has negatively affected the crop production to a greater extent by registering poor crop growth and yield parameters.