00490nam a22001337a 4500003000400000082001900004245011800023260002700141300001400168546001200182650006900194650004400263650004900307OSt  a631.8 bVIR/SO  aSoil fertility and fertiliser use:bv.4 nutrient management and supply system for sustaining agriculture in 1990s  aNew DelhibIFFCOc1990  axiv,357p.  aEnglish  aPresent agriculture production performance and future challenges  aFertilisetr and sustainable agriculture  aExtension education in fertiliser management