Nitrogen Deficiency and Fluoride Susceptibility of Bean Seedlings

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Science  05 May 1961:
Vol. 133, Issue 3462, pp. 1425-1426
DOI: 10.1126/science.133.3462.1425


Groups of bean seedlings (Phaseolits vulgaris) were grown concurrently in cleaned and fluoride-containing (4 to 7 , µg of F- per cubic meter) air in plant-growth chambers for 10 and 20 days with six water-culture treatments: Hoaglund's formulation and Hoaglund's minus potassium, calcium, nitrogen, phosphorus, and iron. An inadvertent 15-hour exposure on day 15 (at 42 µg/m3) produced foliar fluorosis symptoms only on the nitrogen-deficient plants fumigated 20 days, although higher fluoride concentrations were present in the foliage of similar plants grown in the other nutrient-deficient solutions.