[1] German Inst Trop & Subtrop Agr DITSL, D-37213 Witzenhausen, Germany
[2] Univ Kassel, Fac Organ Agr, Dept Agr & Biosyst Engn, D-37213 Witzenhausen, Germany
[3] Univ Hohenheim, Hans Ruthenberg Inst, Inst Agr Sci Trop, Social Ecol Trop & Subtrop Land Use Syst, D-70593 Stuttgart, Germany
[4] Inst Natl Tecnol Agr INTA EEA Bariloche, RA-8400 San Carlos De Bariloche, Argentina
[5] Consejo Nacl Invest Cient & Tecn, RA-2290 Buenos Aires, DF, Argentina