BaukeSperberTamburiniEtAl2018

Référence

Bauke, S.L., von Sperber, C., Tamburini, F., Gocke, M.I., Honermeier, B., Schweitzer, K., Baumecker, M., Don, A., Sandhage-Hofmann, A., Amelung, W. (2018) Subsoil phosphorus is affected by fertilization regime in long-term agricultural experimental trials. European Journal of Soil Science, 69(1):103-112. (Scopus )

Résumé

Arable subsoils store large amounts of phosphorus (P); however, it is unclear to what extent, and under which conditions, subsoil resources might supplement crop P acquisition. Here, we hypothesized that (i) insufficient supply of P in topsoil promotes P acquisition from subsoil and (ii) subsoil P cycling is regulated by nitrogen (N) supply. We sampled two German long-term fertilizer trials in Thyrow (sandy soil) and Gießen (loamy-clayey soil) to 100-cm depth. Treatments received either NPK, NK or PK fertilizer for > 60 years. We assessed soil inorganic (Pi) and organic (Po) P pools following Hedley sequential extraction, and the oxygen isotopic composition of HCl-extractable phosphate (δ18OHCl-P), which differentiates P from primary and secondary (previously biologically cycled) minerals. We found that in the Hedley sequential extraction subsoil resin-P stocks (30–100 cm) in NK plots were 60% (Thyrow) and 8% (Gießen) less than those in NPK plots. Subsoil HCl Pi stocks in NK exceeded those of NPK plots by 70% in Thyrow, but not in Gießen. The NK treatments showed significantly smaller subsoil δ18OHCl-P values than NPK treatments, indicating a predominance of primary (not biologically cycled) minerals and refuting our hypothesis that P deficiency promotes P acquisition from primary minerals. Under N-limiting conditions, subsoil resin-P stocks exceeded those under NPK fertilizer by 117% (Thyrow) and 22% (Gießen), supporting our second hypothesis. We conclude that an efficient use of subsoil P resources is achieved only when nutrient supply in arable topsoils is sufficient. Highlights: Long-term N and P fertilization promotes use of P from subsoil (> 30-cm depth) Subsoil stocks of resin P were less in NK than NPK fertilized plots Elevated δ18OHCl-P in the subsoil of NPK plots indicates effects by enzymatic activity Small δ18OHCl-P values in the subsoil of NK plots indicate a predominance of primary minerals. © 2018 British Society of Soil Science

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@ARTICLE { BaukeSperberTamburiniEtAl2018,
    AUTHOR = { Bauke, S.L. and von Sperber, C. and Tamburini, F. and Gocke, M.I. and Honermeier, B. and Schweitzer, K. and Baumecker, M. and Don, A. and Sandhage-Hofmann, A. and Amelung, W. },
    TITLE = { Subsoil phosphorus is affected by fertilization regime in long-term agricultural experimental trials },
    JOURNAL = { European Journal of Soil Science },
    YEAR = { 2018 },
    VOLUME = { 69 },
    NUMBER = { 1 },
    PAGES = { 103-112 },
    NOTE = { cited By 10 },
    ABSTRACT = { Arable subsoils store large amounts of phosphorus (P); however, it is unclear to what extent, and under which conditions, subsoil resources might supplement crop P acquisition. Here, we hypothesized that (i) insufficient supply of P in topsoil promotes P acquisition from subsoil and (ii) subsoil P cycling is regulated by nitrogen (N) supply. We sampled two German long-term fertilizer trials in Thyrow (sandy soil) and Gießen (loamy-clayey soil) to 100-cm depth. Treatments received either NPK, NK or PK fertilizer for > 60 years. We assessed soil inorganic (Pi) and organic (Po) P pools following Hedley sequential extraction, and the oxygen isotopic composition of HCl-extractable phosphate (δ18OHCl-P), which differentiates P from primary and secondary (previously biologically cycled) minerals. We found that in the Hedley sequential extraction subsoil resin-P stocks (30–100 cm) in NK plots were 60% (Thyrow) and 8% (Gießen) less than those in NPK plots. Subsoil HCl Pi stocks in NK exceeded those of NPK plots by 70% in Thyrow, but not in Gießen. The NK treatments showed significantly smaller subsoil δ18OHCl-P values than NPK treatments, indicating a predominance of primary (not biologically cycled) minerals and refuting our hypothesis that P deficiency promotes P acquisition from primary minerals. Under N-limiting conditions, subsoil resin-P stocks exceeded those under NPK fertilizer by 117% (Thyrow) and 22% (Gießen), supporting our second hypothesis. We conclude that an efficient use of subsoil P resources is achieved only when nutrient supply in arable topsoils is sufficient. Highlights: Long-term N and P fertilization promotes use of P from subsoil (> 30-cm depth) Subsoil stocks of resin P were less in NK than NPK fertilized plots Elevated δ18OHCl-P in the subsoil of NPK plots indicates effects by enzymatic activity Small δ18OHCl-P values in the subsoil of NK plots indicate a predominance of primary minerals. © 2018 British Society of Soil Science },
    AFFILIATION = { Institute of Crop Science and Resource Conservation (INRES) – Soil Science and Soil Ecology, University of Bonn, Nussallee 13, Bonn, 53115, Germany; Institute of Agricultural Sciences, ETH Zürich, Eschikon 33, Lindau, 8315, Switzerland; Department of Agronomy, Institute of Agronomy and Plant Breeding, Justus Liebig University Gießen, Schubertstraße 81, iessen, Germany; Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin, Albrecht-Thaer-Weg 5, Berlin, 14195, Germany; Thünen Institute of Climate-Smart Agriculture, Bundesallee 50, Braunschweig, 38116, Germany; Institute for Bio- and Geosciences – IBG-3: Agrosphere, Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, Jülich, 52425, Germany },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1111/ejss.12516 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85040785672&doi=10.1111%2fejss.12516&partnerID=40&md5=b75c54aff1d6d31564b4f9db833f67c5 },
}

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