Pesticide residual status in litchi orchard soils in Guangdong, China

• Published in: Huanjing kexue Vol. 31; no. 11; p. 2723
• Main Authors: Yao, Li-Xian, Huang, Lian-Xi, Li, Guo-Liang, He, Zhao-Huan, Zhou, Chang-Min, Yang, Bao-Mei, Guo, Bin
• Format: Journal Article
• Language: Chinese
• Published: China 01.11.2010
• Subjects: China; Environmental Monitoring; Litchi - growth & development; Pesticide Residues - analysis; Soil Pollutants - analysis; China
• ISSN: 0250-3301

Litchi is a famous tropical and subtropical fruit originated in South China. Guangdong is one of the most important litchi production areas in China. Two hundred and eight soil samples were collected in litchi orchards after harvesting the fruit, in which nine often-used pesticides including metalaxyl, mancozeb, carbendazim, deltamethrin, cypermethrin, cyhalothrin, dipterex, dimethoate and dichlorvos were detected. The results showed that the detectable rates of various pesticides were ranked cypermethrin (59.1%) > carbendazim (51.0%) > mancozeb (11.1%) > metalaxyl (6.7%) > cyhalothrin (3.4%). Dimethoate and dichlorvos were detectable in few soil samples, and deltamethrin and dipterex were undetectable in all samples. The percentages of soil samples where different pesticides could be detected in one sample followed the order: one pesticide detectable (40.4%) > two pesticides simultaneously detectable (31.3%) > pesticide undetectable (18.8%) > three pesticides simultaneously detectable (8.2%) > four pesticide