Mechanical wounding under field conditions: A potential tool to increase the allelopathic inhibitory effect of cover crops on weeds?
| Autor: | N.M. van Dam, Martin J. Kropff, H.M. Kruidhof, Christian Ritz, Lammert Bastiaans, Lambertus A. P. Lotz |
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| Rok vydání: | 2014 |
| Předmět: |
growth
Soil Science selection Plant Science PRI Agrosysteemkunde chemistry.chemical_compound Ecogenomics Corporate Staff Concernstaf Cover crop Applied Ecology induction Allelopathy allelochemicals Biomass (ecology) biology Toegepaste Ecologie food and beverages Weed control biology.organism_classification PE&RC Cultural control rye Agronomy chemistry Germination Seedling alfalfa medicago-sativa Glucosinolate Centre for Crop Systems Analysis responses chemical defenses Agrosystems Agronomy and Crop Science competition management |
| Zdroj: | European Journal of Agronomy 52 (2014) B European Journal of Agronomy, 52(B), 229-236 European Journal of Agronomy, 52, pp. 229-236 European Journal of Agronomy, 52, 229-236 |
| ISSN: | 1161-0301 |
| Popis: | To increase the inhibitory effect of soil-incorporated cover crop residues on germination and early growth of weeds, the allelochemical content of the cover crop at the time of soil incorporation should be maximal. We investigated whether mechanical damaging in spring induced the production of allelochemicals in late-summer sown lucerne, winter rye and winter oilseed rape. Allelopathic activity and biomass of intact cover crop plants were determined throughout spring, and mechanically damaged plants were monitored till 14 days after wounding. Allelopathic activity was determined directly by lettuce seedling bioassays (lucerne and winter rye) or indirectly by glucosinolate quantification (winter oilseed rape). During spring, the allelopathic activity per unit biomass of intact plants showed a gradual decline for winter rye and lucerne, and a steep decline at the onset of flowering for winter oilseed rape. All cover crop species attained the highest allelopathic activity per unit area at the end of the sampling period as the increase in biomass surpassed the decline in allelopathic activity per unit biomass. Although mechanical wounding enhanced the allelopathic activity per unit biomass of all three species, the effect was only minor and often just sufficient to compensate for the loss in biomass resulting from wounding. This study therefore indicates that the best option for maximizing the inhibitory effect is to incorporate residues of intact cover crops as late as possible. |
| Databáze: | OpenAIRE |
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