A solution employed at the Foret Academie Experiment Station of Tharandt, Saxony, for the study of the life-history of plants by ” water-culture. ” The formula given by Knop is: Calcic nitrate 4 parts by weight, potassic nitrate i part by w’eight, magnesic sulphate These salts are to be thoroughly mixed and the mixture used in the proportion of I : 2000, I : 1000, I : 500 parts of water. To the solutions when ready for use a drop or two of a solution of some iron-salt, or a decigram of ferric phosphate, must be added.
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