EFFECTS OF CHELATED IRON ON THE GROWTH OF TWO SPECIES OF VALLISNERIA¹

Abstract

Iron, added as (Fe-EDTA)-, was found stimulatory to V. spirulis at a concentration o f 0.05 ppm. (Fe-EDTA)-had no effect upon growth of V. neotropiculis as measured by changes in dissolved oxygen and dry weight. Results are compared with those derived from similar studies with Hydrilla verticillata and Egeriu densu. The implications of lake drawdown and aeration are discussed. (KEY TERMS: Vallisneriu; chelated iron; water management.)