Number of root tips and number of secondary roots of red clover in hydroponic system.

Roots were assessed at the harvest (n = 6, mean ± standard deviation). Exposure concentrations (1<2) are described in detail in Table 2.于收获期对根系进行评估（样本量n=6，结果以平均值±标准差表示）。暴露浓度（1<2）的详细信息详见表2。