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Influence of pH, Calcium, Iron, and Aluminum on the Uptake of Radiophosphorus by Cranberry Plants¹

ABSTRACT

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.

¹ Contribution from the Department of Horticulture, University of Wisconsin, Madison. This research is in part taken from the doctorate thesis submitted by the senior author.

² Former Research Assistant, University of Wisconsin, now Assistant Professor of Biology, Bishop College, Dallas, Texas, and Professor of Horticulture, University of Wisconsin, respectively.

Received for publication May 30, 1967. Accepted for publication January 22, 1968.