Effect of tricyclazole aging in soils on its uptake in rice seedlings

Uptake of tricyclazole from two rice growing soils, viz. clay loam and sandy loam, aged for different time duration, was evaluated in a 2-year study (2023 and 2024). Both soils were treated with tricyclazole at ~ 2 µg/g levels and were aged at room temperature. Uptake of tricyclazole from aged soils was studied under phytotron in rice (var. Pusa Basmati 1121) after 15-days in 2023 study and 15/30 days in 2024 study. Results suggested that uptake of tricyclazole was maximum from freshly treated soils (0 day) and corresponded to 1.37–1.66% (clay loam) and 1.55–1.87% (sandy loam). Tricyclazole uptake from soils decreased with increase in duration of ageing. Uptake was more from sandy loam soil than clay loam soil. Lesser amounts of tricyclazole were recovered from 30-day-old seedlings than 15-day-old seedlings suggesting degradation of tricyclazole in rice seedlings. During ageing tricyclazole degraded following a biphasic dissipation pattern where degradation was slower till 90 days and faster afterword. The average half-life of tricyclazole varied from 67.9 to 78.9 days (clay loam) and 48.0 to 62.9 days (sandy loam). Study suggested that soil’s properties, combined with the aging process, affected bioavailability and subsequent uptake of tricyclazole.