00320nam a2200097Ia 4500008004100000082001600041100003400057245007200091260005200163300000700215140113s9999    xx            000 0 und d  a631.45   L2  a"Ray, H.E. & Nambiar, E.K.S."  aSoil fertility evaluation for increased farm production and profits  a1972bFerilizer Association of IndiacNew Delhi  a48