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Autoradiographic Evidence for the Differential Effect of Four Plant Species in Altering the Calcium Content of the Rhizosphere Soil¹

ABSTRACT

Changes in the concentration of Ca in the soil about the roots of four species were observed with autoradiographic procedures. Ryegrass (Lolium rigidum, Gaud.), subclover (Trifolium subterraneum L.), and capeweed (Arctotheca calendula (L.) Levyns) all caused accumulations of Ca about the roots as more arrived by mass-flow than was absorbed. Lupins (Lupinis digitatus, Forsk.) absorbed larger amounts and caused Ca depletion about the root. There was agreement between calculated and observed changes in the Ca concentration in the rhizosphere zone.

¹ Paper No. 3874, Purdue University Agr. Exp. Sta., Lafayette, Ind. 47907. Contribution from the Dept. of Agronomy, Purdue University and Division of Plant Industry, CSIRO, Wembley, W. Australia. The research was conducted in the Division of Plant Industry, CSIRO Western Australian Laboratories while the senior author was on sabbatical leave. The senior author was supported in part by a National Science Foundation Senior Post Doctoral Fellowship.

² Professor of Agronomy, Purdue University and Principal Research Scientist, CSIRO, Western Australian Laboratories, Wembley, W. Australia, respectively.

Received for publication March 9, 1970. Accepted for publication March 19, 1970.