00436nam a2200169Ia 4500008004100000041001200041082001000053082001100063100002100074100001100095245008100106260001400187260000900201260000900210365002500219650002200244150901s9999    xx            000 0 und d  aEnglish  a631.4  bNAM/SO  aNambiar K K  M    eAuthor  aSoil fertility and crop productivity under long term fertilizer use in India  aNew Delhi  bICAR  c2002  a50/-                  asoil productivity