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Distribution and dynamics of boron in Tunisia: Contribution to the study of boron distribution and dynamics in some typical soils of Tunisia

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Description

Boron is a soil microelement with a narrow margin between deficiency and toxicity. The results show a decrease in available boron with depth for calcareous soils (Luvisol-1, Vertisol, Fluvisol and Cambisol), while they increase in non-calcareous soils (Luvisol-2 and Luvisol-3). Calcareous soils contain more total boron than non-calcareous ones. Chemical fractionation shows that readily soluble boron represents less than 1.7% of the total, while the residual fraction exceeds 97.5%. Granulometric fractionation reveals that the majority of available boron is associated with the silty fraction (51%), followed by the sandy (34%) and clayey (15%) fractions. In terms of humic substances, humic acids account for 70.69% of total boron, compared with 27.88% for fulvic acids and 1.43% for humin. Adsorption and desorption follow the Freundlich isotherm, with high boron retention during the desorption process. In hydroponics, the optimum boron dose for lettuce (Lactuca sativa L.) is 0.5-5 mg/kg to avoid toxicity. However, for soil-grown lettuce, this concentration may exceed 5 mg/kg.

Product Specifications

Format
paperback
Domain
Amazon UK
Release Date
26 December 2025
Listed Since
27 December 2025

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