Using spinach (Spinacia oleracea L.) andpakchoi (.Brassica. campestris ssp chinensis L.) as materials, using sodium selenite as selenium source. Effects of different concentrations of selenite on the growth and nutrient absorption were studied in plant cultured by hydroponic solution. Effects of selenite on the activities of antioxidase in plant were studied. The selenium uptake and inversion and effects of selenite and sulphate on the plant growth and contents of nutrient were also studied. The...