Nitrogen Deficiency and Fluoride Susceptibility of Bean Seedlings

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Abstract
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.