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

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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.
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  • National Science Foundation

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