Dissipation of chlorpyrifos on pakchoi inside and outside greenhouse

Article type: Research Article

Authors: YU, Yun-long | FANG, Hua | WANG, Xiao | YU, Jing-quan | FAN, De-fang

Affiliations: Department of Plant Protection, Zhejiang University, Hangzhou 310029, China | Department of Horticulture,College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, China

Note: [] Corresponding author. E-mail: ylyu@zju.edu.cn

Abstract: The dissipation of chlorpyrifos on pakchoi inside and outside greenhouse was studied. The decline curve of chlorpyrifos on pakchoi could be described as first-order kinetic. The experimental data showed that both the hermetic environment of greenhouse and season affected dissipation rates of chlorpyrifos on pakchoi. Chlorpyrifos declined faster outside greenhouse than inside greenhouse. Chlorpyrifos residues at pre-harvest time were below the maximum residue limits (MRLs) fixed in China, whereas the values inside greenhouse were higher than those outside greenhouse by almost 50%. The recommended pre-harvest time established under conditions of open field might not always fit to greenhouse production.

Keywords: chlorpyrifos, residue, dissipation, pakchoi, greenhouse

Journal: Journal of Environmental Sciences, vol. 17, no. 3, pp. 503-505, 2005