Effects of synthetic Zn chelates on flax response and soil Zn status

  • Demetrio Gonzalez Universidad Politécnica de Madrid (UPM). ETSIAAB, Dept. Química y Tecnología de Alimentos. Ciudad Universitaria s/n, 28040 Madrid
  • Patricia Almendros Universidad Politécnica de Madrid (UPM). ETSIAAB, Dept. Química y Tecnología de Alimentos. Ciudad Universitaria s/n, 28040 Madrid
  • Jose M. Alvarez Universidad Politécnica de Madrid (UPM). ETSIAAB, Dept. Química y Tecnología de Alimentos. Ciudad Universitaria s/n, 28040 Madrid
Keywords: available Zn, crude fiber, fertilizer, soil Zn speciation, tensile properties


Throughout the world, flax (Linum usitatissimum L.) is often grown in Zn-deficient soils, but appropriate fertilizer management can optimize both crop yield and micronutrient content. A greenhouse experiment was conducted on Typic Haploxeralf (pH 6.1) and Typic Calcixerept (pH 8.1) soils to study the relative efficiency of chelated Zn using two application rates of three different Zn sources [Zn-EDDHSA, ethylenediamine-di-(2-hydroxy-5-sulfophenylacetate of Zn); Zn-HEDTA, N-2-hydroxyethyl-ethylenediaminetriacetate of Zn; and Zn-EDTA, ethylenediaminetetraacetate of Zn]. Dry matter /DM) yield, Zn concentration, chlorophyll content, crude fiber and tensile properties were monitored and the soil-Zn status (available-Zn, Zn-fractions and total-Zn) was assessed. Zinc chelate applications increased the most labile forms of Zn in soils and Zn concentrations in plants. The low rate of Zn generally had a beneficial effect on DM yield and tensile properties. The exception was Zn-EDTA in the weakly acidic soil, where the highest Zn concentrations were observed in leaves and whole shoots; this coincided with the largest concentrations of labile Zn in soil. The most efficient fertilizers were Zn-EDDHSA (in both soils) and Zn-EDTA (in the calcareous soil). The relatively large amounts of labile and available Zn present in both of the soils fertilized with Zn-EDTA points to the applying this chelate at lower rate than 5 mg Zn/kg; this should, in turn, reduce the cost of Zn fertilization and minimize environmental pollution risk.


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Author Biographies

Demetrio Gonzalez, Universidad Politécnica de Madrid (UPM). ETSIAAB, Dept. Química y Tecnología de Alimentos. Ciudad Universitaria s/n, 28040 Madrid

Patricia Almendros, Universidad Politécnica de Madrid (UPM). ETSIAAB, Dept. Química y Tecnología de Alimentos. Ciudad Universitaria s/n, 28040 Madrid

Jose M. Alvarez, Universidad Politécnica de Madrid (UPM). ETSIAAB, Dept. Química y Tecnología de Alimentos. Ciudad Universitaria s/n, 28040 Madrid


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How to Cite
GonzalezD., AlmendrosP., & AlvarezJ. M. (2016). Effects of synthetic Zn chelates on flax response and soil Zn status. Spanish Journal of Agricultural Research, 14(3), e1104. https://doi.org/10.5424/sjar/2016143-8765
Soil science