1. EEA INTA Manfredi; Ruta Nacional no. 9 km 636, 5988 Manfredi Córdoba Argentina
2. Facultad de Ciencias Agropecuarias; Univ. Nacional de Córdoba, CC 509; 5000 Córdoba Argentina
3. National Institute of Agronomical Research; Environment and Arable Crops, BP 01; 78850 Thiverval-Grignon France