8270 1 archive 4832 disk0/00/00/82/70 2006-10-23 2009-08-20 14:32:08 2009-08-20 14:32:08 conference_item show 0 en uk uk-cor-2002 se uk-other 26-28 March 2002 UK Organic Research 2002 Conference Aberystwyth never 0 TRUE paper Jonsson Simon pub 1plantprod 4plant Colloquium of organic researchers; COR; crop production; mineral balance; farming system; rotation This report was presented at the UK Organic Research 2002 Conference. In order to develop organic dairy production a system study called “The Öjebyn Project” was started in 1990. Öjebyn is a research station of The Swedish University of Agricultural Sciences in northern Sweden. There is 104 hectares of arable land; 58 hectares are grown organically and 46 hectares are grown conventionally. The feed produced on the farm was fed to around 50 dairy cows in each system. There has been a crop rotation of six years and a careful handling of farmyard manure and urine from the dairy cows. The crop yields have been recorded for twelve years as have the quality of each crop in terms of energy, protein and mineral content (P, K, Ca, and Mg). The difference in yield between the two systems has been changing over time. During the first three years there was a diminishing yield in the organic system, followed by a steady increase in yield. In the conventional system there was no such trend, on the contrary there was a tiny decreasing trend. Today’s conclusions about total crop yields from the systems would be quite opposite as if they were made six years ago. The organic system has throughout the study delivered crops with higher content of Ca, P and Mg but with a lower content of K. These differences in mineral concentrations affect the need of different mineral supply to the cows and at the end even the animal health. 2002 published Proceedings of the UK Organic Research 2002 Conference Organic Centre Wales, Institute of Rural Studies, University of Wales Aberystwyth Powell Jane et al. Bengtsson H; Öborn I; Andersson A; Nilsson I; Steineck S; Gustafson, G; Jonsson S (1999). Cadmium and zinc fluxes and balances in organic and conventional dairy farming - preliminary results. In: Proceedings of Extended Abstracts from the Fifth International Conference on the Biogeochemistry of Trace Elements, Eds. W W Wenzel & D C Adriano & B Alloway & H E Doner & C Keller & N W Lepp & M Mench & R Naidu & GM Pierzynski, pp 426-427. Vienna. Austria. Bengtsson H; & Öborn I; & Holmqvist J; & Jonsson S; & Nilsson I; Andersson A; (2001). Field balances of some mineral nutrients and trace elements in organic and conventional dairy farming – A case study at Öjebyn, Sweden. Submitted. Gustafson G; & Salomon E; & Jonsson S; & Steineck S. (2001). Fluxes of P, K and Zn in a conventional and an organic dairy farming system through feeds, animals, manure and urine – A case study at Öjebyn, Sweden. Submitted. Jonsson, S. (1997). Õkoloogiline piimatootmine on konkurentsivõimeline. In: Põhja-Rootsi katsetalu tulemused kuue aasta järel. Mahepõllumajanduse leht. Nr. 5, pp. 5-7. Jonsson, S. 1999. ”The Öjebyn-project – organic production of food”, Publication translated into Russian. 8 pages. Jonsson, S. (2001). Results from the Öjebyn project. Eleven years of organic production. In: Proceedings of the 4th NAHWOA Workshop, 24-27 March 2001, Wageningen. Holland. Olsson, I-M; & Jonsson, S; & Oskarsson, A. (2001). Cadmium and zinc in kidney, liver, muscle and mammary tissue from dairy cows in conventional and organic farming. In: Journal of Environmental Monitoring, 3, pp 531-538. Öborn, I; & Gustafson, G; & Salomon, E; & Lundgren, A; & Bengtsson, H; & Jonsson, S; & Holmqvist; & J., Nilsson; & Andersson, A. (2001). Farm gate and farm balances of P, K and Zn in Sweden. In: ”Element balances as a sustainability tool”. Workshop in Uppsala, 16-17 March 2001. Swedish University of Agricultural Sciences, Food 21 and Swedish Institute of Agricultural and Environmental Engineering. Uppsala. Sweden. Organic and conventional dairy farming at Öjebyn Farm in Northern Sweden. Submitted. public 43-46 6159 1 8270 1 application/pdf en public

Jonsson_crop_yields_Ojebyn_project.pdf

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