title: EDTA Shuttle Effect vs. Lignosulfonate Direct Effect Providing Zn to Navy Bean Plants (Phaseolus vulgaris L'Negro Polo') in a Calcareous Soil.
abstract: Zn-Lignosulfonates (LS) fertilizers are used as an eco-friendly alternative to chelate formulations. The mechanisms of Zn release in the rhizosphere by both types of products are compared. The ability to provide Zn toPhaseolus vulgaris Lof non-modified and chemically modified ZnLS and ZnEDTA is compared in a hydroponic assay. Stable isotope67Zn was used to study Zn source (fertilizer, ZnFer, or native, ZnNat) uptake and distribution in plants in two soil pot experiments. ZnEDTA was the best treatment to provide both ZnFerand ZnNatto navy bean plants. A shuttle effect mechanism and an isotopic exchange may occur. ZnLS from eucalyptus (ZnLSE) provides more Zn to the plant than LS from spruce. Chemical modifications of ZnLSE does not improve its efficiency. A double dose of ZnLSE provides similar ZnFerin leaves and similar soluble ZnFercontent in soil than ZnEDTA. A model for the Zn fertilizers behavior in the soil and plant system is presented, showing the shuttle effect for the synthetic chelate and the direct delivery in the rhizosphere for the ZnLS complex.
authors.affiliation: Department of Agricultural Chemistry and Food Science, Autonomous University of Madrid Madrid, Spain.
authors.forename: María T
authors.initials: MT
authors.lastname: Cieschi
authors.affiliation: Department of Agricultural Chemistry and Food Science, Autonomous University of Madrid Madrid, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Benedicto
authors.affiliation: Department of Agricultural Chemistry and Food Science, Autonomous University of Madrid Madrid, Spain.
authors.forename: Lourdes
authors.initials: L
authors.lastname: Hernández-Apaolaza
authors.affiliation: Department of Agricultural Chemistry and Food Science, Autonomous University of Madrid Madrid, Spain.
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Lucena
keywords: 67Zn; ZnEDTA; lignosulfonates; navy beans; shuttle effect