• Fertilizer and Plant Nutrition Bulletins (including guides and manuals) http://www.fao.org/ag/agp/plantnutrition/fpn_publ.htm#aglnbu
• Improving plant nutrient management for better farmer livelihoods, food security and environmental sustainability (2006)                                                                                              http://www.fao.org/docrep/010/ag120e/ag120e00.htm
   
  Efficiency of soil and fertilizer phosphorus use (2008) http://www.fao.org/docrep/010/a1595e/a1595e00.htm
• Fertilizer Specifications
  http://www.fao.org/agriculture/crops/core-themes/theme/spi/plantnutrition/fertspecs/it/
• AGP - On-line Documents on Soil Fertility and Plant Nutrition http://www.fao.org/ag/agp/plantnutrition/onlinedocs.jsp