00385nam a2200145Ia 4500008004100000082002000041100001900061245005100080250000600131260003100137300000800168650002300176650001800199653002200217170901s2001    xx            000 0 und d  a589.70913bG36N  aGiller, Ken. E 0aNitrogen Fixation in Tropical Cropping Systems  a2  aUKbCABI, Publishingc2001  a423  aBotanical sciences  aPure Sciences  aNitrogen fixation