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Aminopolycarboxylic acid (APCA) complexones, commonly referred to as ligands or chelating agents, like ethylenediaminetetraacetic acid (EDTA) and diethyle- netriaminepentaacetic acid (DTPA), are commonly used in soluble fertilizers to supply copper (Cu), iron (Fe), manganese (Mn), and/or zinc (Zn) to plants. Offsite runoff and contamination of surface waters with these chelating agents is of increasing concern as a result of their reported ability to remobilize heavy metals in sediments and their low susceptibility to biodegradation. The APCA ethylenediaminedisuccinic acid (EDDS) is a structural isomer of EDTA with the (S,S#) stereoisomer of the complexone, a compound naturally produced by actinomycetes, and is biodegradable. Information on the use of (S,S#)-EDDS as a chelating agent in formulating soluble fertilizers for the production of horticultural crops is limited. Therefore, a series of studies were conducted with the objectives of evaluating Fe(S,S#)-EDDS as an Fe-chelate fertilizer agent in the production of marigold and (S,S#)-EDDS (free ligand) and/or Fe(S,S#)-EDDS spectral properties and vulnerabilitytophotodegrdation.Marigoldgrowninpeat-basedmediawerefertilizedwith complete nutrient solution containing 1 mgL -1 Fe from FeEDDS, FeEDTA, or FeDTPA. There was no significant difference in foliar Fe or Mn between Fe-chelate treatments, averaging 140 mgg -1 and 88 mgg -1 , respectively, nor were there significant differences in leaf dry weight (2.30 g) between Fe treatments. Spectra of (S,S#)-EDDS and Fe(S,S#)- EDDS produced from ferrous or ferric sources of Fe absorbed maximally in the 210 to 230 nm and 238 to 240-nm range, respectively. The (S,S#)-EDDS complexone used in the current study, a 30% assay solution, had chromaphoric properties, appearing light yellow in color. When exposed to light, Fe(S,S#)-EDDS quickly degraded at a rate at least twice that of FeEDTA.

hortscience

Iron-[S,S′]-EDDS (FeEDDS) Chelate as an Iron Source for Horticultural Crop Production: Marigold Growth and Nutrition, Spectral Properties, and Photodegradation