| Autor: |
Ilse A. Rasmussen, Kristian Kristensen, Jørgen E. Olesen, Margrethe Askegaard, Bo Melander |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Rasmussen, I A, Melander, B, Askegaard, M, Kristensen, K & Olesen, J E 2014, ' Elytrigia repens population dynamics under different management schemes in organic cropping systems on coarse sand ', European Journal of Agronomy, vol. 58, pp. 18-27 . https://doi.org/10.1016/j.eja.2014.04.003 |
| ISSN: |
1161-0301 |
| Popis: |
Elytrigia repens is a noxious perennial weed in organic cropping systems in Scandinavia. It can easily spread in any crop type and reach unacceptable infestation levels through its proliferation from rhizome fragments. This study aimed at analyzing and quantifying the population dynamics of E. repens recorded in a long-termed crop rotation experiment on coarse sand in Southern Denmark. The study gives an insight into the factors responsible for E. repens population changes and especially those that require particular attention to prevent outbreaks of E. repens. Data originated from three 4-year crop rotations including various cash crops and grass-clover leys; two rotations running during the first two courses with the one replaced with another rotation during the last course. The rotations were combined with four combinations of the treatments; with and without animal manure (‘without’ not in the last course) and with and without catch crops. E. repens was controlled by different tillage tactics and mowing strategies between and within crops and were conducted whenever the population had exceeded certain thresholds. Pulses, either in pure stands or in mixtures with spring barley, and spring cereals (barley and wheat) caused the highest population increases (up to eightfold), especially when preceded by grass-clover. Winter rye and potatoes with ridging cultivations were neutral to the E. repens population. Cultivations between crops were necessary to diminish the infestation and were the main reason for lower infestations in treatments without catch crops. Manuring resulted in a general reduction of E. repens by 28 % when analyzing data from all three courses. The study has identified the crop types that need particular attention when designing crop sequences, the importance of sufficient nutrients supplies to strengthen crop suppression of weeds and the need for mechanical interventions to mange E. repens satisfactorily. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect