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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Barber et al. (1970) studied this question.