Enhanced biomass production in sudangrass induced by co-treatment with copper and EDTA

Three-month soil experiments were conducted to examine the effects of copper (Cu 2+ in the presence of 300 µM EDTA enhanced fresh mass accumulation and photosynthetic activity as well as increased the total sugar content in all parts of plants. The effect of higher Cu 2+ supply (10-6 M) in combination with 300 μM EDTA was not so obvious; the maximal rate of CO 2