de Jonge, L. W.1; Sommer, S. G.2; Jacobsen, O. H.1; Djurhuus, J.1
1 Danish Inst. of Agricultural Sciences, Dept. of Agroecology, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark
2 Danish Inst. of Agricultural Sciences, Dept. of Agricultural Engineering, Research Centre Bygholm, Horsens, Denmark.
Dr. de Jonge is corresponding author: E-mail: [email protected].
Received March 19, 2004; accepted July 8, 2004.