Phytotoxicity of Triafamone 200 SC in transplanted rice and its residual effect on succeeding blackgram

A field study was conducted on clay loam soils at the Agricultural Research Station, Jangamaheswarapuram, Guntur District, Andhra Pradesh, India, during 2017-18 and 2018-19. The study aimed to assess the efficacy of Triafamone 200 SC herbicide in transplanted rice and its residual effects on succeeding blackgram. Among the treatments, T10 (Triafamone 200 SC @ 100 g a.i. ha⁻¹ at 2-3 DAT) and T5 (Triafamone 200 SC @ 100 g a.i. ha⁻¹ at the 2-3 leaf stage) caused slight phytotoxicity, characterized by stunted Rice growth and yellowing of leaves, which was observed 7 days after application. However, plants recovered completely within a week. The weed-free treatment (T13) recorded the highest grain yields of 5762 kg ha⁻¹ and 6376 kg ha⁻¹ in 2017-18 and 2018-19, respectively, followed closely by T12 (Two hand weedings), T10, and T5. The untreated control (T1) yielded significantly lower at 3066 kg ha⁻¹ and 3825 kg ha⁻¹ during the respective years. The succeeding Blackgram crop showed no signs of phytotoxicity or adverse effects, including on germination, growth and yield.