WU Xue-jin, LIU Chun-hua, LUO Jin-hui, LI Chun-li, MA Chen, LE Yuan, WU Nan-cun. 2020: Simultaneous determination of ten plant growth regulators residues in litchi by QuEChERS clean up-ultra high perfor-mance liquid chromatography-tandem mass spectrometry. Journal of Southern Agriculture, 51(10): 2532-2539. DOI: 10.3969/j.issn.2095-1191.2020.10.026