Efficacy of Fe(o,o-EDDHA) and Fe(o,p-EDDHA) isomers in supplying Fe to strategy I plants differs in nutrient solution and calcareous soil.
The FeEDDHA [iron(3+) ethylenediamine di(o-hydroxyphenylacetic) acid] is one of the most efficient iron chelates employed in the correction of iron clorosis in calcareous soils. FeEDDHA presents different positional isomers: the ortho-ortho (o,o), the ortho-para (o,p), and the para-para (p,p). Of these isomers, the p,p cannot chelate Fe in soil solution in a wide range of pH values, while both o,o and o,p can. The objective of this work was to compare the efficiency of both isomers (o,o and o,p) to provide Fe to two Strategy I plants (tomato and peach) in nutrient solution (pH approximately 6.0), as well as in calcareous soil (pH approximately 8.4; CALCIXEREPT). For this, chelates of both o,o-EDDHA and o,p-EDDHA with 57Fe (a nonradioactive isotope of Fe) were used, where the 57Fe acts as a tracer. The results obtained showed that the o,o isomer is capable of providing sufficient Fe to plants in both nutrient solution and calcareous soil. However, the o,p isomer is capable of providing sufficient Fe to plants in nutrient solution but not in calcareous soil.
Rojas
Carmen L
CL
Department of Agronomy, Ecology, and Plant Physiology, Edificio Celestino Mutis (C-4), Campus de Rabanales, University of Córdoba, Córdoba, Spain.
Romera
Francisco J
FJ
Alcántara
Esteban
E
Pérez-Vicente
Rafael
R
Sariego
Cristina
C
Garcaí-Alonso
J Ignacio
JI
Boned
Javier
J
Marti
Gabriel
G
D002118:Calcium / Q000032:analysis; D005029:Ethylenediamines / Q000008:administration & dosage* / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000008:administration & dosage*; D007502:Iron Chelating Agents / Q000008:administration & dosage*; D007536:Isomerism; D063245:Plant Development; D012987:Soil / Q000032:analysis; D012996:Solutions; D013329:Structure-Activity Relationship
D005029:Ethylenediamines; D007502:Iron Chelating Agents; D012987:Soil; D012996:Solutions; C011813:ethylenediamine-N,N'-bis(2-hydroxyphenylacetic acid); D007501:Iron; D002118:Calcium