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    • Fertilizers and their use: A pocket guide for extension officers, fourth edition 

      IFA; Food and Agriculture Organization (Rome: FAO and IFA (International Fertilizer Industry Association), 2000)
      This handbook was prepared originally for use by extension officers working for the FAO Fertilizer Programme. The first edition was published in 1965, third edition was published in 1978, reprinted in 1986. For this new, ...