Nitrogen Deficiency and Fluoride Susceptibility of Bean Seedlings.
Groups of bean seedlings (Phaseolits vulgaris) were grown concurrently in cleaned and fluoride-containing (4 to 7 , microg 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 microg/m(3)) 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.
Adams
D F
DF
Sulzbach
C W
CW