Boron Distribution in Soils and Waters of Egypt
1979
Elseewi, Ahmed A. | Elmalky, A. E.
Saturation extract, hot water-soluble, acid-soluble, and total B fractions were determined in soil samples from profiles representing six geographically diverse areas in Egypt. Saturation extract and hot water-soluble B averaged 0.6 µg/ml and 1.3 µg/g. Acid-soluble and total B averaged 10.2 and 113 µg/g. The acid fraction showed a curvilinear relationship with CaCO₃ content of the soil, and averaged 12.5% of the total B. Total B, on the average, was twice as high in clay samples as in sandy samples, and decreased by about 32% beyond the 60-cm depth of the soil profile. Concentrations of saturation extract B were either similar to or a reasonable multiple of Nile-Water B, indicating that the latter is a direct source of at least water soluble B in these soils. Concentrations of water and acid-soluble B suggest that B status in soils of Egypt is above the sufficiency level, and that under proper soil and water management the incidence of toxicity is unlikely.
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