6Spiers J M.Effects of pI4 levels and nitrogen source on elemental leaf content of tifblue rabbiteye blueberry[J]. Journol of the American Soci- ety for Horticultural Science, 1978,103 : 705-708.
7Eriksson J E. Effects of Nitrogen-containing fertilizers on solubility and uptake of cadmium[J]. Water Air Soil Pollut, 1990,49: 355-368.
