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Ursachen der Chlorosen an Mandarinen (Citrus Reticulata Blanco) der Ägäischen region

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Summary

To ascertain reasons for chlorosis in madarin orchards, microelement content in leaf and soil samples from 20 representative mandarine plantages in tne Izmir-region (Turkey) have been determined. In soil samples also texture, pH and content of P, CaCO3, HCO3 − and salt was analyzed.

Fe-, Zn- and Mn-contents of leaves did not help to clarify the reason for chlorosis.

There was also no significant correlation between the amount of ammoniumacetate soluble microelements in the soil and the appearence of chlorosis.

HCO3 − seems to be the main reason of chlorosis, because its content in most of the chlorotic plantages was raised.

According to these results, improvement of the drainage system as the most important step in curing chlorosis is concluded. Spraying with Fe- and Zn-chelats are considered only as preliminary steps.

Zusammenfassung

Im Gebiet von Gümüssu der Provinz Izmir (Türkei) wurden aus 20 repräsentativen Mandarinenplantagen Blatt- und Bodenproben entnommen und auf Mikroelementgehalte untersucht. In den Bodenproben erfolgte außerdem die Bestimmung der Textur, des pH-Wertes, des Gehaltes an Phosphat, Calciumkarbonat, Bikarbonat und Salz.

Die Gehalte der Blätter an Eisen und anderen Mikroelementen ergaben keinen Aufschluß über die Chloroseursache.

Es bestanden auch keine gesicherten Korrelationen zwischen den NH4-azetatlöslichen Mikroelementgehalten des Bodens und dem Auftreten der Chlorose.

Eigentliche Ursache der Chlorose scheint das HCO3 − zu sein, da sich, in der Mehrzahl der Fälle eine erhöhte Bikarbonat-Konzentration im Boden chloroseerkrankter Plantagen feststellen ließ.

Aus den Ergebnissen wird geschlossen, daß in erster Linie die Verbesserung der Drainage und der Wasserführung als Maßnahme zur Chlorosebekämpfung in den untersuchten Plantagen erfolgen muß. Fe- und Zn-Chelat-Spritzungen sind nur als vorläufige Maßnahmen zu betrachten.

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Authors and Affiliations

  1. Institut für Pflanzenernährung der Ege Universität, Bornova-Izmir, Türkei

    I. Kovanci,  H. Hakerlerler &  W. Höfner

  2. Braugasse 7, 63 Gießen

    W. Höfner

  3. Bitkibesleme Kürsüsü, Ziraat Fakültesi, Ege-Universitesi, Izmir-Bornova, Türkei

    I. Kovanci &  H. Hakerlerler

Authors
  1. I. Kovanci
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  2. H. Hakerlerler
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  3. W. Höfner
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Kovanci, I., Hakerlerler, H. & Höfner, W. Ursachen der Chlorosen an Mandarinen (Citrus Reticulata Blanco) der Ägäischen region. Plant Soil 50, 193–205 (1978). https://doi.org/10.1007/BF02107168

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  • DOI: https://doi.org/10.1007/BF02107168

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