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The agricultural value of sewage sludges is well known and a lot of published data has demonstrated the positive effects of sludge appli- cations on plant growth and yield. These effects are probably due mainly to the nitrogen and phosphorus content of sewage sludges. But, as sludges are more organic than mineral, we can expect an effect of the organic matter added to the soil on soil fertility. Certainly, in the future, landspreading of sludges will be regulated, taking into account pollution hazards for waters (excess of nitrogen and phosphorus supply compared to plant needs and soil...

La construction du nouveau centre des archives a dA(c)butA(c) en 2009. L'ensemble architectural est constituA(c) de deux parties: les bA timents satellites pour l'accueil du public et l'immeuble de grande hauteur pour la conservation des documents dans des magasins d'archives. Des poutres actives permettent le traitement d'air des satellites tandis qu'une gaine d'air pulsA(c)e est utilisA(c)e pour l'IGH. Une rA(c)gulation innovante est installA(c)e dans les magasins pour obtenir une faible variation d'hygromA(c)trie et de tempA(c)rature. A l'aide de simulations thermiques dynamiques, nous...

Proceedings of the EEC Seminar Organized jointly by the CEC and the Institute for Soil Fertility, Haren (Gr) and held in Groningen, The Netherlands, June 12-13, 1980