Abstract: We investigated the combined toxicological effects of tetracycline + chlortetracycline (TC-CTC) and tetracycline + sulfadiazine (TC-SD) on the growth and development of Chinese white cabbage seedlings under potculture. The results showed that the growth of shoots and roots of cabbage were promoted by the TC-CTC and TC-SD at a concentration of 0.5 mg·kg^-1. With increasing concentration, the growth of shoots and roots were gradually inhibited. The inhibitive effects on root length were higher than that on shoot length. The inhibition rate of root length was up to 72.7% by TCCTC at 25 mg·kg^-1. Compared to single pollutant, TC-CTC and TC-SD significantly decreased the content of soluble protein in cabbage. The maximum inhibition rate of 67.1% was presented in the treatment of TC-CTC at 25 mg·kg^-1 after 30 days. Moreover, the activities of superoxide dismutase, peroxidase and catalase were inhibited more under such treatment, highlighting a synergistic effect.

Key words: Phosphorus, Arsenic, Adsorption, Yellow soil, Red soil, Brown soil