Pfeffer Salt Solution

Originally cited by Knudson, 1925. Physiological studies of the  symbiotic germination of orchid seeds. Botanical Gazette, 79, 345-79. 

Ca(NO3)2  800 mg  KCl  100 mg  K2HPO4  200 mg  KNO3  200 mg  MgSO4 * 7 H2O  200 mg  FeCl3  8 mg  Soluble starch  5 g

Source: Rasmussen, H. Terrestrial orchids from seed to mycotrophic plant. Cambridge University Press, Cambridge. 1995.