Nutrient Solutions for Orchids

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Abstract
The paper considers 2 nutrient solns. proposed by Vacin and Went, and by Vacin,respectively. These authors state that the Knudson soln. C for the germination of orchid seed and the growth of seedlings is unsuitable because it is not adequately buffered in respect to H- ions. Expts. reveal that the Vacin-Went soln. and the Vacin soln. cause chlorosis and very poor growth as contrasted with excellent growth on Knudson soln. C. It is indicated that the Ca phosphate used by Vacin and Went is responsible for chlorosis because of its capacity to adsorb Fe and Mn. The critical pH range from 4.5 to 5.5 emphasized by Vacin and Went is shown to be invalid.