Fate of carbofuran in rice-fish and livestock farming
1987
Tejada, A.W. | Magallona, E.D.
A pesticide management survey in rice producing area was conducted to establish some benchmark information on pesticide usage. This revealed that most farmers (99%) relied on pesticides for crop protection. Other information gathered was on the frequency of application, the most commonly used pesticide, the preharvest interval and protective clothings. A supervised pesticide residue trial showed that carbofuran and BPMC + chlorpyrifos were still detected at harvest time on rice leaves. Carbofuran was further tested in small scale rice-fish system. Fish and snails were able to bioaccumulate carbofuran residues 110 and 10 times, respectively, the concentration of residues in water at levels which was still within the tolerance limit. Carbofuran residues in aquatic plants (Ipomoea aquatica) were still within the Acceptable Daily Intake for man. When carbofuran contaminated leaves were fed to goats for seven consecutive days, it was rapidly excreted in urine (77%). A few was eliminated in faeces (1%) and secreted in milk (0.5%). The total residues of 14C-carbofuran were accumulated in the different tissues of goats but thin layer and gas chromatographic analysis showed that most residues were non toxic. Proper use of carbofuran in rice-fish-livestock farming would appear to present no risks to animals or man.
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