00338nam a2200133Ia 4500008004100000082002000041245003100061260002900092650001300121650002200134650001800156650001300174650001700187220204s9999    xx            000 0 und d  a631/635bADV.07 0aAdvances in agronomy. V 07  aNew YorkbAcademicc1955  aAgronomy  aMineral nutrition  aSoil nitrogen  aUS crops  aWeed control