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  1. 1
    North American and international research projects
    “...PPI...”
    Report
  2. 2
    Potash in Indian farming : for balance, quality, efficiency and top yields
    by Tiwari, K N
    Published 2000
    “...PPI...”
    Printed Book
  3. 3
    Southern forages
    by Ball,Donald M
    Published 1991
    “...PPI...”
    Printed Book
  4. 4
    Bettter crops with plant food
    Published 2001
    “...Potashand phosphate institute of (ppi)...”
    Printed Book
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