Evaluation of controlled release formulation of thiobencarb in rice fish ecosystems using radiochemical technique
1992
Bajet, C.M. | Araez, L.C. | Fabro, L.E. | Magallona, E.D. (Philippines Univ., Los Banos, College, Laguna (Philippines). National Crop Protection Center)
The corn cob based formulation of thiobencarb released maximum concentration in water at 7 days after application (DAA) and sustained up to 56 DAA as compared to the alginate based formulation which slowly released the active ingredient and attained the maximum at 56 DAA. The corn cob based formulation was more useful since release coincided with the critical period for weed competition in rice. The LC50 of thiobencarb to Tilapia (Oreochromis niloticus) was found to be 0.234 mg/l. Bioaccumulation of fast (TA1) and slow (TA2) corn cob based formulation at 0.2 microgram/g, concentration and exposure time of 7 days were 0.256 and 0.285 microgram/g, respectively. Average concentration of thiobencarb in dead fish fillet was 0.312 and 0.332 microgram/g respectively for TA1 and TA2. Low level of uptake of thiobencarb from TA1 and TA2 was found for both young and old leaves of kangkong, Ipomoea aquatica. The stalk absorbed most of the 14C thiobencarb and no significant yield difference was found between commercial and controlled release formulations applied at 1.5 and 0.75 kg ai/ha.
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