Notice of RetractionEffect of Nitrogen Form on the Plant-Availability of Cr in Soil and Uptake of Cr by the Leersia Hexandra Swartz

Notice of Retraction

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The effect of N form on growth and uptake of Cr by the hyper accumulator Leersia Hexandra Swartz was investigated in pot experiments. The results indicated that the maximum Cr concentration in the dry root, stem and leaf matter of Leersia hexandra treated with (NH4)2 S04 reached 19546mg kg^-1, 3265 mg kg^-1, 6118 mg kg^-1, which were 1.5 to 4 times the weight of the CK. A higher biomass was obtained when N was supplied as NH₄NO₃, and biomass difference was not significant between treatment with (NH₄)₂SO₄ Ca(NO₃)₂ and CK, regardless whether soil applied with 400 mg kg^-1 Cr or not. Sugar in plants treated with 400 mg kg"1 was more than that of lOOmg kg^-1 among (NH₄)₂SO₄, NH₄NO₃ and Ca(NO₃)₂ But the chlorophyll and protein contents were most high when applied with NH₄NO₃ The results showed that supplying N as NH₄NO₃ promoted growth best and most high concentration of soluble sugar could possibly provide an adaptive mechanism under adverse circumstances.