00271nam a2200097Ia 4500008004100000082002000041245003100061260002900092650002600121650002600147220204s9999    xx            000 0 und d  a631/635bADV.40 0aAdvances in agronomy. V 40  aNew YorkbAcademicc1986  aCrop simulation model  aWhite clover agronomy