Nodulation of lucerne (Medicago sativa L.) roots: depth distribution and temporal variation
| Autor: | F. Li, T. Kautz, R. Pude, U. Köpke |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Plant, Soil and Environment, Vol 58, Iss 9, Pp 424-428 (2012) |
| Druh dokumentu: | article |
| ISSN: | 1214-1178 1805-9368 |
| DOI: | 10.17221/314/2012-PSE |
| Popis: | This study was undertaken in order to test whether the development of nodule density over the vegetation period is different in lucerne stands grown for 1, 2 or 3 years continuously. For rapidly assessing nodule density in the field, a modified profile wall method was applied. Nodules were counted on a vertical profile wall, after spraying away a 2 cm layer of soil. For validating this method nodule density was determined on roots washed from monolith samples. Field data indicate that there is a shift of nodulation towards deeper soil layers with increasing maturity of lucerne stands. In 1-year lucerne nodulation was limited virtually to the top 15 cm of soil. In the 15-30 cm soil layer and in the subsoil (30-80 cm), nodule density increased with the cropping duration (1 year < 2 years < 3 years). Temporal decreases in nodule density during the vegetation period associated with dry spells were more pronounced for 2-years as compared with 3-years lucerne. |
| Databáze: | Directory of Open Access Journals |
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