Resource efficient control of couch grass
Optimal timing of stubble cultivation and cutting of a grass/clover catch crop
Project responsible: Lars Andersson, Department of Crop Production Ecology (CPE), SLU.
Project group: Göran Bergkvist and Björn Ringselle (PhD student), both at CPE, SLU; Helena Aronsson, Department of Soil and Environment, SLU; Anders Eriksson, Swedish Rural Economy and Agricultural Societies.
This project is integrated with a project financed by Swedish Farmers’ Foundation for Agricultural Research (SLF: Effective control of couch grass with reduced nutrient leaching - an adaptation to Integrated Pest Management) with the main aim to develop strategies for non-chemical control of couch grass (Elymus repens L.) with reduced nutrient leaching and energy use. Strategies are based on optimal timing and minimized stubble cultivation, using the competitive effect of a catch crop in combination with cutting. The project encompasses two field studies, one of which includes registrations of nitrogen and phosphorous leaching. In addition, the project constitutes an important part of a PhD project, jointly financed by SLU and The Swedish Farmers' Foundation for Agricultural Research (SLF).
In the SLF project, we use a grass species as catch crop. In this complementary project we have added one more aspect, namely the ability to fixate nitrogen. We consider this multi-functionality very interesting as it at least partly offers a solution to one dilemma of organic cropping; the need to catch nitrogen, and at the same time reduce leaching and control the perennial weeds. In the field experiments we will therefore use a grass/clover mixture as catch crop. We hypothesize that the good ability of the mixture to reduce the soil nitrogen and its superior ability to produce large amount of biomass in autumn makes it at least as good a competitor against couch grass as a grass monoculture.
A reference group is linked to the project: Ann-Marie Dock-Gustavsson (Swedish Board of Agriculture), Per Ståhl (Swedish Rural Economy and Agricultural Societies), Erik Ekre (Växa), Angelika Neumann (post-doc, SLU), and Maria Stenberg and Gunnar Torstensson (SLU).
Ringselle, B., Prieto-Ruiz, I., Andersson, L., Aronsson, H., Bergkvist, G. 2017. Elymus repens biomass allocation and acquisition as affected by light and nutrient supply and companion crop competition. Annals of Botany 119, 477-485. DOI: https://doi.org/10.1093/aob/mcw228
Ringselle B, Bergkvist G, Aronsson H and Andersson L. 2015. Importance of timing and repetition of stubble cultivation for post-harvest control of Elymus repens. Weed Research. DOI: 10.1111/wre.12183
Ringselle, B., Bergkvist, G., Aronsson, H. & Andersson. L. 2015. Under-sown cover crops and post-harvest mowing as measures to control Elymus repens. Weed Research 55, 309–319. DOI: 10.1111/wre.12144
Aronsson H, Ringselle B, Andersson L and Bergkvist G. 2015. Combining mechanical control of couch grass (Elymus repens L.) with reduced tillage in early autumn and cover crops to decrease nitrogen and phosphorus leaching. Nutrient Cycling in Agroecosystems 102:383–396. DOI 10.1007/s10705-015-9712-7
Ringselle B, Andersson L, Aronsson H and Bergkvist G. 2014. The effect of cover crops and mowing on the abundance and biomass of Elymus repens. NJF seminar 471 - Recent advances in IWM of perennial and annual weeds, with a special emphasis on the role of crop-weed interactions, Sweden. NJF Report 10 (1), p 12.
Ringselle B, Andersson L, Aronsson H and Bergkvist G. 2014. Timing of stubble cultivations is important for the control of Elymus repens. 10th EWRS Workshop on Physical and Cultural Weed Control, Alnarp, Sweden, p 35.
Ringselle B, Andersson L, Aronsson H and Bergkvist G. 2013.
The effect of cover crops and mowing on the abundance and biomass of Elymus repens. 16th European Weed Research Society (EWRS) Symposium, Turkey, p 83.