A Study on Cation Exchange Reaction in Undisturbed Soil Columns of Farm Land
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概要
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In order to model the transport of fertilizer components from soil surface to groundwater in farm land, a preliminary experiment, in which a KCl solution was infiltrated through undisturbed soil columns, was carried out and cation exchange capacity (CEC) and selectivity coefficients (K<SUB>Ca/M</SUB>, M: Na<SUP>+</SUP>, K<SUP>+</SUP>, Mg<SUP>2+</SUP> ) were determined.<BR>The soil columns consisted of two kinds of soils: a top layer of soil containing organic material and a lower layer of decomposed granite soils. The CEC values of the two soil layers were5-20 and3-7 meq/100g of dry soil, respectively. In the columns, the exchange reaction of Ca<SUP>2+</SUP> with K<SUP>+</SUP> was dominant. The K<SUB>Ca/K</SUB> was approximated as a function of the adsorbed potassium molar fraction, whereas the K<SUB>Ca/Mg</SUB>, was constant at about 1.2.
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