oa Agrochemophysica - Amelioration of subsurface acidity by leaching of surface applied amendments. A laboratory study*

Volume 7, Issue 3
  • ISSN : 0302-7112



Ca:Al exchange equilibria in acid soils and clay minerals indicated that A1 is strongly preferred to Ca on the exchange complex, but that A1 concentration in the equilibrium solution is low when A1 saturation of the exchange complex is less than 60 to 80%. Leaching of soil columns after application of Ca(OH)2, Ca-nitrate and gypsum indicated that the effect of Ca(OH)2 was limited to the site of application, whereas Ca- nitrate and gypsum increased exchangeable Ca and decreased A1 throughout the column. The decrease in exchangeable A1 was ascribed to an anion induced polymerization of A1 as well as exchange and leaching of A1 by Ca. *Part of thesis submitted by the senior author for the degree Ph.D. Agric. at the University of Stellenbosch. Received 15 January 1975.

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