Abstract
Soil chemical extractions are widely used to predict the nutritional status of soils. However, the correlation between extracted elements and plant uptake is often poor, especially if compared over a range of soil types. The aim of this study was to examine a new method called Diffusive Gradients in Thin films (DGT), which measures the diffusive supply of elements, thereby mimicking a plant root. The ability of DGT to assess plant-available P, Zn and Cu was tested in a wide range of typical Scandinavian agricultural soils along with conventional methods (EDTA and DTPA for Cu and Zn; NaHCO3 for P and soil solution concentrations). Extracted soil concentrations were compared to that of the element in the youngest fully developed leaf of barley (Hordeum vulgare L.) grown in pots. For Zn and P, only DGT could predict plant uptake while conventional extraction methods and soil solution analyses performed poorly. All soil tests could predict Cu concentration in leaves, but the DGT technique proved to be most accurate followed by the soil solution concentration of Cu. We conclude that DGT is much more accurate at predicting plant-available P, Zn and Cu than commonly used methods for analysing plant-available nutrients in soil.
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Acknowledgements
This project was supported by research grants provided by: The Danish Agency for Science, Technology and Innovation, Ministry of Science, Technology and Innovation and the Danish Knowledege Center for Agriculture, Agro Food Park, Aarhus, DK.
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Tandy, S., Mundus, S., Yngvesson, J. et al. The use of DGT for prediction of plant available copper, zinc and phosphorus in agricultural soils. Plant Soil 346, 167–180 (2011). https://doi.org/10.1007/s11104-011-0806-y
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DOI: https://doi.org/10.1007/s11104-011-0806-y