ISHS Acta Horticulturae 567: IV International Strawberry Symposium
OCCURRENCE AND EFFECTIVENESS OF INDIGENOUS MYCORRHIZA OF SOME STRAWBERRY FIELDS IN FINLAND |
| Authors: | M. Vestberg, S. Kukkonen, M. Uosukainen |
| Keywords: | Arbuscular mycorrhizal fungi, Fragaria x ananassa, spore density, mycorrhizal effectiveness |
| DOI: | 10.17660/ActaHortic.2002.567.106 |
| Abstract:
The role of indigenous arbuscular mycorrhizal fungi (AMF) was studied in 11strawberry fields. One of these field was managed organically while the others were managed conventionally. The effectiveness of AMF was studied in a bioassay with flax (Linum usitatissimum L.) as a mycorrhiza-dependent host and benomyl was used to create the non-mycorrhizal control. Mycorrhizal effectiveness was determined as the relative difference in flax growth in untreated and benomyl-treated soil. AMF spore density and species richness were also determined. The study showed that AM fungi were well distributed in all strawberry fields despite high levels of phosphorus in some cases. Soil from the organically managed farm contained three to five times more AMF spores than soil from the conventionally managed farms. In the bioassay, the indigenous mycorrhiza caused positive growth responses in the soil from most fields. A highly fertilized field where the acid acetate-extractable phosphorus exceeded 100 mg litre-1 soil was an exception. Here, the indigenous mycorrhiza caused strong growth reduction. It remains unclear, however, whether this occurs also in the field. | |
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