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Miscible Displacement of Nitrate through Soil Columns¹

ABSTRACT

One hundred milliliters of an aqueous solution containing 0.55 g of CaCl₂ and 0.35 g of Ca(NO₃)₂ · 4H₂O was displaced through 30-cm long acrylic plastic columns containing soil. Velocity of water flow, sucrose concentration of the solution, and water content of the columns affected the loss of nitrate. Nitrate loss was determined by comparing breakthrough curves of nitrate with chloride. No nitrate was lost at a flow velocity of 1.32 cm/hr, but 21% was lost at 0.11 cm/hr. At a flow velocity of 0.11 cm/hr and sucrose concentrations of 0, 50, and 200 ppm, the losses of nitrate amounted to 21, 21, and 67%, respectively, of the total added. A net gain of nitrate was observed under unsaturated flow conditions.

Key Words: denitrification • unsaturated flow • mineralization

¹ Journal Paper no. J-5572 of the Iowa Agr. & Home Econ. Exp. Sta., Ames, Ia. Project 998. Work supported by the US Atomic Energy Commission, Contract no. AT-(11-1)-1269, Report no. COO-1269-13. The second author acknowledges support of a Senior Post-Doctoral National Science Foundation Fellowship. Presented before Div. S-3, Soil Science Society of America, Aug. 24, 1966, at Stillwater, Okla.

² Research Assistant, Visiting Associate Professor, and Professor, Agronomy Department, Iowa State Univ.

Received for publication December 30, 1966. Accepted for publication April 4, 1967.