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Efficiency of a new strategy involving a new class of natural hetero-ligand iron(III) chelates (Fe(III)-NHL) to improve fruit tree growth in alkaline/calcareous soils

Authors

  • Marta Fuentes,

    1. CIPAV TimacAGRO International-Roullier Group, Polígono Arazuri-Orcoyen, C/C No. 32, E-31160 Orcoyen, Spain
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    • These authors contributed at the same level of importance to this work.

  • María F Ortuño,

    1. Department of Irrigation, Centro de Edafología y Biología Aplicada del Segura, CEBAS-CSIC, Campus Universitario de Espinardo, PO Box 164, E-30100 Espinardo, Spain
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    • These authors contributed at the same level of importance to this work.

  • Francisco Pérez-Sarmiento,

    1. Department of Irrigation, Centro de Edafología y Biología Aplicada del Segura, CEBAS-CSIC, Campus Universitario de Espinardo, PO Box 164, E-30100 Espinardo, Spain
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  • Eva Bacaicoa,

    1. CIPAV TimacAGRO International-Roullier Group, Polígono Arazuri-Orcoyen, C/C No. 32, E-31160 Orcoyen, Spain
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  • Roberto Baigorri,

    1. CIPAV TimacAGRO International-Roullier Group, Polígono Arazuri-Orcoyen, C/C No. 32, E-31160 Orcoyen, Spain
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  • Wenceslao Conejero,

    1. Department of Irrigation, Centro de Edafología y Biología Aplicada del Segura, CEBAS-CSIC, Campus Universitario de Espinardo, PO Box 164, E-30100 Espinardo, Spain
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  • Arturo Torrecillas,

    1. Department of Irrigation, Centro de Edafología y Biología Aplicada del Segura, CEBAS-CSIC, Campus Universitario de Espinardo, PO Box 164, E-30100 Espinardo, Spain
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  • José M García-Mina

    Corresponding author
    1. CIPAV TimacAGRO International-Roullier Group, Polígono Arazuri-Orcoyen, C/C No. 32, E-31160 Orcoyen, Spain
    2. Department of Chemistry and Soil Chemistry, Faculty of Sciences, University of Navarra, PO Box 273, E-31080 Pamplona, Spain
    • CIPAV TimacAGRO International-Roullier Group, Poligono Arazuri-Orcoyen, C/C No. 32, E-31160 Orcoyen, Spain.
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Abstract

BACKGROUND: Iron (Fe) chlorosis is a serious problem affecting the yield and quality of numerous crops and fruit trees cultivated in alkaline/calcareous soils. This paper describes the efficiency of a new class of natural hetero-ligand Fe(III) chelates (Fe-NHL) to provide available Fe for chlorotic lemon trees grown in alkaline/calcareous soils. These chelates involve the participation in the reaction system of a partially humified lignin-based natural polymer and citric acid.

RESULTS: First results showed that Fe-NHL was adsorbed on the soil matrix while maintaining available Fe for plants in alkaline/calcareous solution. The effects of using three different sources as Fe fertilisers were also compared: two Fe-NHL formulations (NHL1, containing 100% of Fe as Fe-NHL, and NHL2, containing 80% of Fe as Fe-NHL and 20% of Fe as Fe-ethylenediamine-N,N′-bis-(o-hydroxyphenylacetic) acid (Fe-EDDHA)) and Fe-EDDHA. Both Fe-NHL formulations increased fruit yield without negative effects on fruit quality in comparison with Fe-EDDHA. In the absence of the Fe-starter fraction (NHL1), trees seemed to optimise Fe assimilation and translocation from Fe-NHL, directing it to those parts of the plant more involved in development.

CONCLUSION: The field assays confirmed that Fe-NHL-based fertilisers are able to provide Fe to chlorotic trees, with results comparable to Fe-EDDHA. Besides, this would imply a more sustainable and less expensive remediation than synthetic chelates. Copyright © 2012 Society of Chemical Industry

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