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Potassium Adsorption and Exchange Selectivity within an Anhydrous Ammonia Fertilizer Band

Dep. of Agronomy, Ohio Agriculture Research and Development Center, Wooster, OH 44691

S. J. Traina and J. W. Johnson

Dep. of Agronomy, 2021 Coffey Rd., Ohio State Univ., Columbus, OH 43210

*Corresponding author.

ABSTRACT

Fertilizer use efficiency of K can be low in soils that adsorb K⁺ in a nonexchangeable form. Simultaneous proximal injection of anhydrous ammonia (AA) and KCl solution in such a soil, however, has been shown to increase exchangeable and solution K⁺. In order to better understand the mechanisms for this effect, the exchange of K and Ca in a Hoytville silty clay loam soil (fine, illitic, mesic Mollic Ochraqualf) previously injected with AA was investigated across dimensions of distance and time from the point of AA injection. Data for both soil adsorbed and equilibrium solution K and Ca were obtained directly. Exchange isotherms and calculated Vanselow selectivity coefficients showed K selectivity was decreased near the point of AA injection and this effect diminished with increasing distance and time from the injection point. The greatest changes in selectivity occurred near the K end member of the exchange isotherms. Total adsorbed metal charge (Q) was increased by AA injection and the increase in Q was greatest near the Ca end member of the isotherms. This evidence suggests that (i) pH increases with AA injection temporarily increased the Ca selectivity of the soil organic fraction, giving a decrease in total soil K selectivity, and (ii) direct interactions between K⁺ and NH⁺₄ on mineral surfaces had little effect on K selectivity.

Salaries and research support provided by state and federal funds appropriated to the Ohio Agric. Res. and Dev. Center, the Ohio State Univ. Manuscript no. 156-92. Received 8 No. 1991.

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