Abstract:

A field experiment was conducted to reveal residue dynamics of mancozeb in cucumber and Soil. The residues of mancozeb in cucumber and soil were determined by gas chromatography with ECD detector. The average recoveries of mancozeb were in a range of 89.02%-95.50% in cucumber and 86.59%-93.03% in soil. The results showed that the Mancozeb dissipated rapidly in cucumber and soil. The half-life of mancozeb in cucumber and in soil were 1.57d -3.51d and 3.85d -11.44d respectively. When the cucumber was sprayed three times with mancozeb W.D.G，and the last application was done 2 days before harvesting，the final residues of mancozeb in cucumber was lower than 2 mg?kg-1 ，demonstrating that it is safe to apply mancozeb to cucumber with the recommended rate.