Soluble salt content of greenhouse soils as a diagnostic aid
1944
Merkle, F.G. | Dunkle, E.C.
The results obtained in testing commercial greenhouse soils for available nutrients revealed that there are many instances in which the growers have used too much soluble fertilizing materials. This study embraced a determination of the water-extractable organic and inorganic matter in a large number of greenhouse soils, together with a determination of the electrical conductivity of the aqueous extracts. The following observations and conclusions are made: 1. There is a close relationship between the total soluble matter and the electrical conductivity of aqueous soil extracts. 2. There is a close relationship between the inorganic soluble matter and the electrical conductivity of aqueous soil extracts. 3. The electrical conductivity of the extract is a reliable measure of the soluble matter content. 4. Excessive salt content is of common occurrence among greenhouse soils, about 20% of those encountered being probably excessive. 5. Tentatively the "ceiling value" for germination of several greenhouse plants is placed at 200 X 10(-5) mhos for the 1:2 aqueous extract. 6. Measurement of soluble salt content by electrical conductivity is a useful diagnostic aid in the solution of greenhouse soil problems.
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