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- Title
Inhibitory effects of Plantago lanceolata L. on soil N mineralization.
- Authors
Dietz, Marko; Machill, Susanne; Hoffmann, Herbert; Schmidtke, Knut
- Abstract
Background and aims: Nitrate leaching from intensively cropped soils represents a huge environmental problem. In order to diversify the range of nitrogen management strategies, this investigation is focused on the effects of ribwort plantain, Plantago lanceolata L., and its allelochemicals on soil N mineralization. Methods: High-performance liquid chromatography was used in this study for phytochemical analysis of the major allelochemicals aucubin, catalpol, and verbascoside. Soil incubation experiments demonstrated a significant suppression of soil N mineralization caused by the incorporation of the iridoid glycoside (IG) aucubin, leaf material of two varieties ( P. lanceolata cv. Libor and cv. Arterner), and an aqueous extract of P. lanceolata leaves. Results: Throughout the growing season, the two varieties conspicuously differed in aucubin and verbascoside contents as well as in leaf dry weight. In soil incubation experiments, incorporated leaf material of both varieties affected long-term low soil nitrate concentrations. Experimental aucubin application resulted in an inhibitory effect on soil N mineralization. This was not true for the IG catalpol. Furthermore, we observed a negative relationship between IG concentrations and inorganic soil nitrogen concentrations when the soil was incubated with aqueous P. lanceolata leaf extract of different concentrations. Conclusion: This study enforced the hypothesis that allelochemicals of P. lanceolata have an active role in a suppression effect on soil N mineralization. Further research may be necessary to investigate the specific effects of P. lanceolata allelochemicals on the nitrogen cycle.
- Subjects
PLANTAGO lanceolata; MINERALIZATION; NITRATES; SOIL composition; VERBASCOSIDE; ALLELOCHEMICALS; NITROGEN cycle
- Publication
Plant & Soil, 2013, Vol 368, Issue 1/2, p445
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-012-1524-9