1. National Agricultural Research Foundation (NAGREF); Fodder Crops and Pastures Institute; 413 35 Larissa Greece
2. Dep. of Agronomy; Aristotle Univ. Farm of Thessaloniki; 570 01 Thermi Greece
3. Lab. of Agronomy, Faculty of Agriculture; Aristotle Univ. of Thessaloniki; 541 24 Thessaloniki Greece
4. 41 Palaiologou Larissa 41223 Greece