1. Faculty of Bioscience Engineering, Division of Soil and Water Management K.U. Leuven Univ. Celestijnenlaan 200E, PostBox 02411 B‐3001 Leuven Belgium
2. Faculty of Agronomy Univ. Mayor de San Andres (UMSA) Héroes del Acre No. 1850 La Paz Bolivia
3. Faculty of Agronomy Univ. Tecnica de Oruro (UTO) Av. 6 de Octubre Oruro Bolivia
4. Water Resources, Development and Management Service, Land and Water Division FAO Room B‐721, Via delle Terme di Caracalla 00135 Rome Italy