[1] Univ Florence, Dept Agri Food Prod & Environm Sci, I-50144 Florence, Italy
[2] Univ Milan, Dept Agr & Environm Sci, Milan, Italy
[3] INRA, AgroParisTech, UMR EcoSys 1402, F-78850 Thiverval Grignon, France
[4] Colorado State Univ, NREI, Ft Collins, CO 80523 USA
[5] Univ Sassari, Dept Agr Sci, Desertificat Res Ctr, I-07100 Sassari, Italy
[6] INRA, F-63039 Paris, France
[7] Res Ctr Soil Plant Syst, CREA RPS, Via Navicella 2-4, I-00184 Rome, Italy
[8] Univ Aberdeen, Inst Biol & Environm Sci, St Machar Dr, Aberdeen AB24 3UU, Scotland
[9] Queensland Univ Technol, Brisbane, Qld, Australia
[10] INRA, UR AgroImpact 1158, Site Laon, F-02000 Barenton Bugny, France
[11] INRA, FARE Lab, F-51100 Reims, France
[12] New Zealand Inst Plant & Food Res, Lincoln 7608, New Zealand
[13] Agr & Agri Food Canada, Ottawa, ON K1A 0C6, Canada
[14] INRA, UREP, F-63039 Clermont Ferrand, France
[15] CNR, IBIMET, Via Caproni 8, Florence, Italy
[16] Blackland Res & Extens Ctr, Texas A&M AgriLife Res, Temple, TX USA