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  • 5%     , 15%,   150% . : Taylor, C. 2003. "Fertile Ground". Smart Money, Mart 2003.
  • 10%. : U.S. Department of Energy, 1995.

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  • 45 , 30 . 300 ( ), 500 ( )
  • 50 -, - , , , . : "Gardening: It`s Good For You!", National Gardening Association
  • , , - , - - , , .      : Kaplan, S., J.F. Talbot, and R. Kaplan. 1998. "Coping With Daily Hassies"