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Model of Boron Movement in Soils

Arava Research and Development, Arava Research Station, Hevel Eilot 88820, Israel

L. M. Dudley and R. J. Hanks

Dep. of Plants, Soils, and Biometeorology, Utah State Univ., Logan, UT 84322-4820

ABSTRACT

A model to predict B transport in calcareous soils is presented. The model considers one-dimensional, non-steady-state soil water flow, convective-dispersive solute transport of both noninteracting salts (i.e., Cl) and B. The model was designed to simulate field situations including infiltration, evaporation, transpiration, drainage, and water extraction by plant roots. Predlctions were compared with field B profiles and column leaching studies. The model accurately simulated B leaching from columns of B-contaminated soils under saturated and steady-state water flow conditions. Model simulations, under conditions of transient water flow and transient B concentrations in a column study, were in reasonable agreement with the measured values. Model predictions were also compared with evolving soil soluble-B profiles determined in a field study (5–7 yr) with repeated irrigation with saline, B-containing waters. Computed results of the B accumulation in the upper portion of the soil profile, and of the B front, were in good agreement with measured data.

Contribution from Arava Research Station and the Dep. of Plants, Soils, and Biometeorology, Utah State Univ., Logan.

Received for publication April 2, 1991.

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