Influence of pH, Calcium, Iron, and Aluminum on the Uptake of Radiophosphorus by Cranberry Plants1
- K. C. Medappa and
- M. N. Dana2
Radiophosphorus accumulation by the cranberry (Vaccinium macrocarpon L.) was studied in relation to pH, Ca, Fe, and Al in nutrient solutions. There was no direct effect of H+ activity on radiophosphorus (32P) accumulation by the plants between pH 3 and 7. However, with the medium at pH 8, phosphorus (P) accumulation was depressed. From media at pH 3 to 7, the plants were capable of accumulating comparable amounts even at low levels of 32P activity. Calcium concentrations from 0 to 750 ppm and Fe concentrations from 0 to 50 ppm had no appreciable effect on the uptake of 32P. Phosphorus accumulation tended to increase with the addition of 1.2 ppm Al but decreased with 12 ppm or more. This decrease in P accumulation in the presence of Al was more pronounced at pH 6.5 than at pH 3.5 or 4.5. It is suggested that at the highest pH value aluminum phosphate precipitated both inside and outside the root tissue and thereby impaired P accumulation in the shoots.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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