RUTGERS MIX: As Potting Medium

Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 5 years ago.

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The 7-1-1-1 ratio is used by 16% of U.S. commercial growers: 7 parts fir bark; i part coarse peat moss, 1 part Palco redwood wool, 1 part coarse perlite; the Off alteration on this has a lower pH. A86-493; you can add to 1Ocu. ft. of this mix 3 lbs. bone meal, 2.5 lbs. pulverized limestone, 1/2 lb. tankage fertilizer and 1/2 lb. 5-10-5 fertilizer. See: The O.D.
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RUTGERS MIX: Potting Media Sometimes called the 7-1-1-1 mix; 7 parts fir bark, 1 part peat moss (coarse or poultry peat), 1 part Palco wool, 1 part coarse perlite; it has a higher pH than the Off mix; seems to have a proper balance between aeration, drainage and water retention; to each ten cf. is added 3 lbs. bone meal, 2 to 3 lbs. pulverized limestone, 1/2 lb. tankage type fertilizer and 1/2 lb. of 5-10-5 fertilizer. Dodson and Gillespie, Biology of the orchids (1967) p.91 0

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