Abstract:

Effects of lead on alfalfa（Medicago sativa L.） seed germination and growth were studied by cultivating experiment. The results showed that the effects of lead on the germination rate of seeds and germination energy were not significant when Pb2+ concentration ranged from 0 to 100 mg/kg. The general trend of seeds germination rate and germinating energy showed slight decrease at first and then gradually recovered. It indicated that alfalfa seed had certain extent patience for lead. The treatments with different Pb2+ concentrations could inhibit the growth of bugs and roots significantly, and had stronger inhibition on root than that of plumule. When Pb2+ concentration was over 250 mg/kg, the index of seed vigor was decreased, and it inhibited seed germination and seedling growth of alfalfa evidently.