A multifunctional tool in vegetable growing
Project coordinator: Birgitta Rämert, Department of Crop Production Ecology, SLU
Project colleagues: Anna Mårtensson, Sadhna Alström, Jan Lagerlöf, Peter Hambäck, Lena Gäredal, Ylva Eklind, Bengt Lundegårdh, Sven Hellqvist, Birgitta Båth and Elisabeth Ögren.
The aim of this interdisciplinary research programme is to develop locally adapted vegetable growing systems with the help of green manure crops. Green manure crops with nitrogen-fixing legumes add locally produced nitrogen to the cultivation system.
This project is investigating different ways to utilise the nitrogen fixed in green manure crops and how these affect plant nutrient supply to the commercial crop, attack by pests through effects on their population dynamics and internal quality of the produce. We are also investigating how crop security and the economy of the grower are affected. Within the programme, we are studying four different systems for using green manure in white cabbage growing:
- Direct incorporation of the green manure crop
- Intercropping of green manure crop and commercial crop
- Biodigestion of the biomass from the green manure crop
- Composting of the biomass from the green manure crop
Six commercial growers are participating in the experiments. The project also includes two large shared field trials, Uppsala and Umeå, where 10 researchers are collaborating. All aspects of green manuring are being weighed together to produce a growing system that is financially and organically sustainable.
Björkman, M., Hambäck, P.A., Hopkins, R.J. and Rämert, B. 2010. Evaluating the enemies hypothesis in a clover-cabbage intercrop: effects of generalist and specialist natural enemies on the turnip root fly (Delia floralis). Agricultural and Forest Entomology, DOI 10.1111/j.1461-9563.2009.00452.x
Björkman, M., Hopkins, R.J. Hambäck, P.A. and Rämert, B. 2009. Effects of plant competition and herbivore density on the development of the turnip root fly (Delia floralis) in an intercropping system. Arthropod-Plant Interactions 3(1), 55-62. DOI 10.1007/s11829-009-9055-x
Björkman, M., Hopkins, R.J. and Rämert, B. 2008. Combined effect of intercropping and turnip root fly (Delia floralis) larval feeding on the glucosinolate concentrations in cabbage roots and foliage. Journal of Chemical Ecology, 34(10), 1368-1376. DOI 10.1007/s10886-008-9533-0
Björkman, M. 2007. Effects of intercropping on the life cycle of the turnip root fly (Delia floralis). Doctoral diss. Dept. of Crop Production Ecology, SLU. Acta Universitatis agriculturae Sueciae vol. 2007:125.
Björkman, M., Hambäck, P.A. and Rämert, B. 2007. Neighbouring monocultures enhance the effect of intercropping on the turnip root fly (Delia floralis). Entomologia Experimentalis et Applicata 124, 319-326. DOI: 10.1111/j.1570-7458.2007.00589.x