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Hummert's Helpful Hints is a handy reference to the formulas, calculations and tables that give equivalencies, parts per million, measurements of pH, soluble salt and geometric areas. Also covers fertilizers, irrigation, light and lighting, plant structures & more.

35 pages, illustrated

Detalles de publicación

  • Publicado: 1999
  • Editor: Hummert International
  • Dewey Decimal: 640.2
  • Librería ECHO: 640.2 HUM