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Regeneration of Soluble Boron by Reclaimed High Boron Soils¹

ABSTRACT

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.

¹ Contribution from the Dep. of Soil & Environmental Sciences, Univ. of California, Riverside, CA 92521.

² Graduate Fellow and Professor of Soil Science, Univ. of California, respectively. The senior author is currently Postdoctoral Research Associate, Dep. of Agronomy & Soils, Washington State Univ., Pullman, WA 99164.

³ Research Leader (Soil & Water Chemistry) U. S. Salinity Laboratory, Riverside, CA 92501.

Received for publication April 12, 1984. Accepted for publication October 16, 1984.

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