Regeneration of Soluble Boron by Reclaimed High Boron Soils1
- F. J. Peryea,
- F. T. Bingham2 and
- J. D. Rhoades3
The ability of reclaimed high boron (B) soils to reestablish elevated soil solution B concentrations has been termed boron regeneration. Three natively high B soils and three B-amended soils were “reclaimed” in laboratory columns using four leaching strategies. The reclaimed soils were stored for 30 d and releached. Effluent B concentrations increased in all soils during storage, producing potentially phytotoxic concentrations in some cases. Regeneration was enhanced by increasing the solution driving force during initial leaching or by high post-reclamation moisture content. Regenerated B concentrations were inversely related to the quantity of water used for reclamation. Each unreclaimed soil appeared to contain a finite amount of reclaimable B. The soil regenerative ability diminished with depletion of the reclaimable B component. Periodic leaching controlled the redevelopment of excessive B concentrations, eventually leading to permanent reclamation. The six soils fell into two behavioral groups when fitted to an empirical B reclamation model. The recently boronated soils were more efficiently reclaimed than those containing native B. The model reasonably approximated the initial leaching data of the natively high B soils; however, regeneration of soluble B caused the experimental data to deviate from the model prediction. Allowing soluble B to regenerate between leaching water applications may enhance leaching efficiency and reduce reclamation water requirements.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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