60 CADERNOS DE ANÁLISE E PROSPETIVA CULTIVAR N.º 23 AGOSTO 2021 Van Calker, K.J., Berentsen, P.B.M., Romero, C., Giesen, G.W.J., Huirne, R.B.M., (2006). Development and application of a multi-attribute sustainability function for Dutch dairy farming systems. Ecological Economics 57 (3), 640–658. Van-Camp. L., Bujarrabal, B., Gentile, A-R., Jones, R. J. A., Mon- tanarella, L., Olazabal, C. and Selvaradjou, S-K., (2004). Reports of the Technical Working Groups Established under the Thematic Strategy for Soil Protection. EUR 21319 EN/1, 872 pp. Office for Official Publications of the European Communities, Luxembourg. Van den Putte, A., Govers, G., Diels J., Gillijns, K., Demuzere, M., (2010). Assessing the effect of soil tillage on crop growth: A meta-regression analysis on European crop yields under conservation agriculture. European Journal of Agronomy . 33 (3 ), 231-241. World Commission on Environment and Development (WCED), (1987). Our Common Future. Oxford University Press, Oxford, pp. 416.