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Foliar fertilization to control iron chlorosis in pear (Pyrus communis L.) trees

AuthorsÁlvarez-Fernández, Ana ; García Laviña, María Pilar ; Fidalgo Pinilla, Carolina ; Abadía Bayona, Javier ; Abadía Bayona, Anunciación
KeywordsAcidic foliar applications
Foliar fertilization
Pyrus communis
Iron deficiency
Iron chlorosis
Issue DateJun-2004
PublisherKluwer Academic Publishers
CitationPlant and Soil 263 (1-2): 5- 5 (2004)
AbstractThe effectiveness of foliar fertilization to re-green chlorotic leaves in iron-deficient pear trees has been studied. Trials were made to assess the influence of (i) the level of Fe deficiency, (ii) the leaf surface treated (adaxial or abaxial), and (iii) two different surfactants, L-77 and Mistol. Treatments were ferrous sulphate alone, ascorbic, citric and sulphuric acids, applied either alone or in combination with ferrous sulphate, Fe-DTPA and water as a control. Solutions were applied with a brush and leaves were treated twice each year. None of the treatments caused a full recovery from Fe deficiency chlorosis. Treatments containing Fe caused the largest re-greening effects, and FeSO4 had a similar re-greening effect to Fe(III)-DTPA. Increases in leaf Chl were more pronounced with abaxial leaf surface applications and in severely deficient leaves. Using Fe(III)-DTPA in foliar sprays does not seem to be justified, since their effects are not better than those of FeSO4. The joint use of Fe(III)-DTPA and L-77 and that of FeSO4 and citric acid do not seem to be suitable. With a single foliar application, FeSO 4 combined with acids gave slightly better results than FeSO 4 alone. Acidic solution applications without Fe may be effective in alleviating chlorosis in some cases, especially in the case of citric acid. In the current state of knowledge, foliar fertilization cannot offer yet a good alternative for full control of Fe chlorosis, although its low environmental impact and cost make this technique a good complementary measure to soil Fe-chelate applications and other chlorosis alleviation management techniques. Abbreviations: Chl - chlorophyll; EDDCHA - ethylenediamine di(5-carboxy-2- hydroxyphenylacetic) acid; EDDHA - ethylenediamine di(o-hydroxyphenylacetic) acid; EDDHMA - ethylenediamine di(o-hydroxy-p-methylphenylacetic) acid; EDDHSA - ethylenediamine di(2-hydroxy-5-sulfophenylacetic) acid.
Publisher version (URL)http://dx.doi.org/10.1023/B:PLSO.0000047717.97167.d4
Identifiersdoi: 10.1023/B:PLSO.0000047717.97167.d4
issn: 0032-079X
Appears in Collections:(EEAD) Artículos
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