Effects of Different Chabazite Zeolite Amendments to Sorption of Nitrification Inhibitor 3,4-Dimethylpyrazole Phosphate
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SHORT COMMUNICATION
Effects of Different Chabazite Zeolite Amendments to Sorption of Nitrification Inhibitor 3,4-Dimethylpyrazole Phosphate (DMPP) in Soil Giacomo Ferretti 1 & Katharina Maria Keiblinger 2 & Barbara Faccini 1 & Dario Di Giuseppe 3 & Axel Mentler 2 & Sophie Zechmeister-Boltenstern 2 & Massimo Coltorti 1 Received: 25 September 2019 / Accepted: 21 January 2020 # Sociedad Chilena de la Ciencia del Suelo 2020
Abstract Application of natural zeolitites (ZTs, rock with > 50% of zeolites) as a soil amendment is recognized as a suitable method for increasing substrate quality. ZT is used at natural state or pre-enriched with specific cations (e.g., NH4+) to slow-release nutrients. ZT at natural state has been shown to mitigate gaseous N losses and favor crop yield, while NH4-enriched ZT has been reported to show quick NO3− production and relatively high gaseous N losses. The use of nitrification inhibitors (NIs) could alleviate these losses. In this work, the sorption behavior of a synthetic NI 3,4-dimethylpyrazole phosphate (DMPP) on different soil-ZT mixtures as well as on pure ZTs (natural and NH4enriched) was tested. High sorption of NI can reduce its inhibitory effects and consequently the nitrogen use efficiency (NUE). Results show that natural ZTs had a deficient capacity for DMPP sorption and thus decreased the possibility to retain DMPP once applied to the soil. The sorption capacity strongly positively correlated to soil organic C content, supporting that sorption was mainly driven by soil organic matter. Any types of ZT added to the soil, notably that at natural state, have decreased the potential sorption of DMPP principally because of a dilution of the total organic C which reduced substrate hydrophobicity. A lower DMPP sorption in the substrate can mean higher availability of DMPP to soil microbial biomass and thus a higher potential in inhibiting nitrification. These beneficial effects may result in an advantageous strategy for increasing NUE. Keywords Natural zeolites . NH4+-enriched zeolites . Nitrogen cycle . Agricultural soil . Adsorption . Nitrification . Soil amendment
Giacomo Ferretti and Katharina Maria Keiblinger contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42729-020-00184-3) contains supplementary material, which is available to authorized users. * Giacomo Ferretti [email protected] 1
Department of Physics and Earth Science, University of Ferrara, Via Saragat 1, 44122 Ferrara, Italy
2
Institute of Soil Research, University of Natural Resources and Life Sciences Vienna (BOKU), Peter-Jordan Strasse 82, 1190 Vienna, Austria
3
Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
1 Introduction Natural zeolites are aluminosilicates with fundamental characteristics like high and selective cation exchange capacity (CEC), molecular sieving, and reversible dehydration (Reháková et al. 2004). Thanks to these properties, their applic
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