00382nam a2200145Ia 4500008004100000082002000041245003100061260002900092650001300121650002000134650002400154650001900178650002000197650001900217220204s9999    xx            000 0 und d  a631/635bADV.31 0aAdvances in agronomy. V 31  aNew YorkbAcademicc1979  aAgronomy  aBoron nutrition  aRed clover breeding  aRoot exudation  aSoil microflora  aSoil nutrients