00321nam a2200121Ia 4500008004100000082002200041245003100063260002900094650001300123650002400136650002000160650001900180220204s9999    xx            000 0 und d  a631/635bADV.23;1 0aAdvances in agronomy. V 23  aNew YorkbAcademicc1971  aAgronomy  aNitrogen fertilizer  aPlant germplasm  aRoot exudation