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Knudson C (Knudson, 1946)
Originally cited by Knudson,1946 (A new nutrient solution for orchid seed germination. American Orchid Society Bulletin, 15, 214-17).
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Ca(NO3)2 * 4 H2O
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1000 mg
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KH2PO4
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250 mg
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MgSO4 * 7 H2O
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250 mg
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(NH4)2SO4
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500 mg
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FeSO4 * 7 H2O
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25 mg
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MnSO4 * 4 H2O
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7.5 mg
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Sucrose
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20 g
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Agar
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12-15 g
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May be supplimented with 100-150 g banana, or 100-200 mL coconut water, and 2 g of vegetable charcoal per liter.
Note: This medium does not employ the use of chelated iron, resulting in the formation of insoluble (and therefore unavailable) iron phosphate. As a result, this medium is very iron-poor.
Sources: Arditti, J. Fundamentals of orchid biology. John Wiley and Sons. 1992.
Rasmussen, H. Terrestrial orchids from seed to mycotrophic plant. Cambridge University Press, Cambridge. 1995.
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