The double-pot technique was introduced as a simple method for soil testing. The principle is that seedlings take up nutrients simultaneously from the soil to be investigated and from nutrient solutions of different compositions. The difference in growth between plants on a complete solution and on a solution missing one nutrient is a measure of the availability of that nutrient in the soil.
The method has been applied also for other purposes, using various plant species. Maize and millet were most practical as test crops. It is possible to rank soils by nutrient availability for most nutrients. For P, K and Mg, the results can be interpreted in a more quantitative way, provided that the experiment is carried out according to standard procedures.
- nutrient deficiency symptoms
- relative growth rate
- soil testing
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© 1990 Kluwer Academic Publishers
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Janssen, B.H. (1990). A double-pot technique as a tool in plant nutrition studies. In: van Beusichem, M.L. (eds) Plant Nutrition — Physiology and Applications. Developments in Plant and Soil Sciences, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0585-6_127
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