004440000a22001210004500060000800000082001900008100001900027245008200046260005600128260000900184300000800193650012100201  a100  a631.80954 NAM4  aNambiar, K K M  aSoil fertility and crop productivity under long term fertilizers use in india  aNewdelhi, Publications & information division, ICAR  c1994  a144  aSoil fertility-effect of fertilizers/crop productivity-india-effect of fertilizer use/fertilizers-agriculture- india