[Pesticide residual status in litchi orchard soils in Guangdong, China].
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 pesticides simultaneously detectable (1.4%). The concentrations of mancozeb in detectable samples averaged 39.05 microg x kg(-1), and that of cypermethrin was 7.83 microg x kg(-1). The mean concentrations of the other five pesticides ranged from 0.19 microg x kg(-1) to 1.65 microg x kg(-1). Totally, the pesticide residue status in litchi orchards in Guangdong was venial.
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Soil and Fertilizer Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China. lyaolx@yahoo.com.cn
Li-Xian
LX
Yao
Lian-Xi
LX
Huang
Guo-Liang
GL
Li
Zhao-Huan
ZH
He
Chang-Min
CM
Zhou
Bao-Mei
BM
Yang
Bin
B
Guo
D002681:China; D004784:Environmental Monitoring; D032125:Litchi / Q000254:growth & development*; D010573:Pesticide Residues / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*
D010573:Pesticide Residues; D012989:Soil Pollutants