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CHLORIDE MASS BALANCE TO DETERMINE WATER FLUXES BENEATH KCl-FERTILIZED CROPS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Transactions of the ASAE.  VOL. 43(6): 1553-1559 . (doi: 10.13031/2013.3055) @2000
Authors:   J. S. Tyner, G. O. Brown, J. R. Vogel, J. Garbrecht
Keywords:   Chloride mass balance, Wheat, Groundwater recharge

The utilization of Chloride Mass Balance (CMB) to determine water fluxes generally has been restricted to applications in arid to semi-arid environments. Only in such environments does the chloride deposited by precipitation and dry fallout concentrate sufficiently by evapotranspiration for accurate measurement. This study successfully applied CMB to dryland winter wheat plots with 860 mm of precipitation per year. Soil cores were collected from long-term dryland winter wheat test plots located near Stillwater, Oklahoma, which had known constant applications of the fertilizer KCl for the past 29 years. This additional chloride was sufficient to allow for accurate chloride concentration measurement. Groundwater recharge rates of 12.2 to 38.9 mm/y were calculated with recharge increasing with fertilizer N. These fluxes may be overestimated by up to 20% based on anion exclusion measurements from adjacent soil cores. Numerical modeling of the chloride distributions beneath the plots supported the assumptions of CMB.

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