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

1970; Wiley; Volume: 34; Issue: 4 Linguagem: Inglês

10.2136/sssaj1970.03615995003400040027x

1435-0661

Stanley A. Barber, Peter G. Ozanne,

Agricultural Science and Fertilization

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.