Abstract
CAN phosphorus, the typical minimum element in plant growth, be a maximum factor for plants even at very low concentrations ? Experiments by Rodhe1 showed that the growth of Dinobryon divergens Imhof and Uroglena americana Calkins was inhibited or the plants were damaged by addition of only 5 µg phosphorus/l. On the other hand, Scenedesmus quadricauda Turpin em. Chod. “required 500–1,000 µg phosphorus/l, in order to reach the lower limit of the optimum interval” (op. cit.). The growth inhibition of Dinobryon and Uroglena by very low phosphorus concentration suggests that this element “even in ordinary lakes may become a maximum factor for some algae”1.
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FORSBERG, C. Phosphorus, a Maximum Factor in the Growth of Characeae. Nature 201, 517–518 (1964). https://doi.org/10.1038/201517a0
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DOI: https://doi.org/10.1038/201517a0
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