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Book of Abstracts

11th IFOAM
Scientific Conference
11-15 August 1996
Copenhagen, Denmark

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Farming strategies and nutrient balances in organic farming systems in Denmark

Mikkelsen, Gunnar

Danish Institute of Plant and Soil Science.Department of Soil Science, Research Centre Foulum, P.O Box 23, DK-8830 Tjele.

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In Denmark, Danish Institute of Plant and Soil Science takes care of Research in Cropping Systems. Ecological crop rotations have been established, since 1987, at three state research stations. Results from the first rotation of a six year fodder crop rotation will be presented. The crop rotation is situated at Research Centre Foulum in the middle of Jutland. The soil type is a coarse sandy loam.The crops have been established in fields of about 1 ha and all crops are present each year. Nutrient balances, yields, pests and diseases, soil nutrients content etc have been measured.In the fodder crop production system nearly half of the area is covered with leguminous plant in combination with grass and cereals. Clover grass and thereby the fixation of nitrogen has been, as years pass, the main fertilizer for the other crops in the rotation. Potassium, on the other hand, with the high input of nitrogen, become the limiting regulator of yield in the rotation. Farm management and a well designed crop rotation conserving nitrogen and controlling weed, are main factors in making ecological and economic sustainable farming systems. A main problem in the long run will be the decreasing value of potassium and how to compensated the loss. In the first rotation very high yields have lowered the plant available potassium. Yield, nutrient balances for N, P and K and farm management will be presented.

Mikkelsen, G. & Mikkelsen, S.A. 1989. Start of Farming Systems Research in Denmark. WPRS Bull. (Bull. SROP), 1989. XII, 5, 7-15.

Mikkelsen, G. 1990. Research in ecological cropping systems at the Danish Research Service for Plant and Soil Science. Biological Farming in Europe. Reur Technical Series 12, 1990.