Abstract
Abstract The fate and residues of pesticides in a rice paddy ecosystem were monitored because this is suspected to contribute more to pesticide pollution than any agroecosystem in the tropics. High pesticide user and low pesticide user farmers were selected in rice‐growing areas for two cropping seasons. In chlorpyrifos‐treated rice fields residues in paddy soil and water remained longer in the high pesticide user's farm than in the low pesticide user's farm. Monocrotophos residues in soil and water remained longer in the supervised field than in the farmer's field. Monocrotophos and chlorpyrifos residues in the immediate atmosphere did not exceed the threshold‐ level value (TLV) of 0.2 mg/m3 of air. Pesticide residues on test animals were within the maximum residue limit (MRL) set by FAO/WHO.
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