oa South African Journal of Agricultural Science - Silicate-phosphate interrelationships in soils.

Volume 9, Issue 3
  • ISSN : 0585-8860



This investigation was undertalcen to study some aspects of the silicate-phosphate interrelationships in eight sandy soils of the Orange Free State Region. In a pot experiment the effect of silicate applications on plant yield and phosphorus uptake were investigated. The silicate additions significantly increased the plant yield and P uptake in certain soils. The increase in "" total available"" phosphorus in some soils when silicate and phosphate were added together, was explained on the basis of the formation of either alumino-silicates or alumino-phosphates. A laboratory experiment revealed that an increase in phosphate applications caused a similar increase in release of water-soluble silicate. The amounts of silicate released were smaIl. These results indicate the possible occurrence of isomorphous substitution of phosphate for silicate in these soils.

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