title: Setting good practices to assess the efficiency of iron fertilizers.
abstract: The most prevalent nutritional disorder in fruit tree crops growing in calcareous soils is Fe deficiency chlorosis. Iron-deficient, chlorotic tree orchards require Fe-fertilization, since chlorosis causes decreases in tree vegetative growth as well as fruit yield and quality losses. When assessing the effectiveness of Fe-fertilizers, it is necessary to use sound practices based in the state-of-the art knowledge on the physiology and biochemistry of Fe deficiency. This review provides an overview on how to carry out the assessment of the efficiency of Fe-fertilizers, discussing common errors found in the literature, outlining adequate procedures and giving real examples of practical studies carried out in our laboratory in the past decade. The review focuses on: i) the design of Fe-fertilization experiments, discussing several issues such as the convenience of using controlled conditions or field experiments, whether fertilizer assessment experiments should mimic usual fertilization practices, as well as aspects regarding product formulations, dosages, control references and number of replicates; ii) the assessment of chlorosis recovery upon Fe-fertilization by monitoring leaf chlorophyll, and iii) the analysis of the plant responses upon Fe-fertilization, discussing the phases of leaf chlorosis recovery and the control of other leaf nutritional parameters.
authors.affiliation: Dept. Plant Nutrition, Aula Dei Experimental Station, Consejo Superior de Investigaciones Científicas (CSIC), P.O. Box 13034, E-50080 Zaragoza, Spain.
authors.forename: Hamdi
authors.initials: H
authors.lastname: El-Jendoubi
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Melgar
authors.forename: Ana
authors.initials: A
authors.lastname: Alvarez-Fernández
authors.forename: Manuel
authors.initials: M
authors.lastname: Sanz
authors.forename: Anunciación
authors.initials: A
authors.lastname: Abadía
authors.forename: Javier
authors.initials: J
authors.lastname: Abadía
mesh_terms: D027461:Beta vulgaris / Q000378:metabolism / Q000502:physiology; D002734:Chlorophyll / Q000032:analysis* / Q000378:metabolism; D018556:Crops, Agricultural / Q000378:metabolism* / Q000502:physiology; D005029:Ethylenediamines / Q000378:metabolism; D005308:Fertilizers; D007501:Iron / Q000378:metabolism*; D010935:Plant Diseases / Q000517:prevention & control; D018515:Plant Leaves / Q000378:metabolism* / Q000502:physiology; D027861:Prunus / Q000378:metabolism / Q000502:physiology; D012987:Soil / Q000737:chemistry
chemical_list: D005029:Ethylenediamines; D005308:Fertilizers; D012987:Soil; C011813:ethylenediamine-N,N'-bis(2-hydroxyphenylacetic acid); D002734:Chlorophyll; D007501:Iron