The aim of the present study was to determine the energy necessary to compress ground lupine seeds to a constant volume, as a function of their moisture content. Produced briquettes were subjected to compression tests, and the changes in their volume were also recorded. The results showed that with an increasing moisture content of ground lupine seeds the energy inputs necessary for the compression of the material to a constant volume decreased for rising strengths and volumes of produced briquettes. Significant differences were observed in the measurements obtained for white and blue ground lupine seeds caused by different chemical compositions of the lupine cultivars. (c) 2007 Elsevier Ltd. All rights reserved.