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Monitoring of Chemical Properties on a Pyritic Disposal-Area Soil after Liming

Dep. of Plant and Soil Science, Univ. of Tennessee, P.O. Box 1071, Knoxville, TN 37901-1071

P. A. Shelton

Southern Illinois Univ., Carbondale, IL 62901

B. Fulton

Virginia

*Corresponding author.

ABSTRACT

Pyrite, when exposed near the surface, oxidizes and generates acidity inhibiting establishment of vegetative cover critical for erosion control. This study was conducted to monitor chemical activity after additions of lime to correct soil acidity. Eight test plots were established on pyritic disposal-area soils that had been created by the excavation of the Tennessee-Tombigbee Waterway near Paden, MS. This disposal soil originated from the deep excavation of the Eutaw geologic formation during construction. Lime application rates were 0, 11, 22, and 44 Mg ha^–1. Double-acid-extractable P, K, Ca, Mg, Na, Fe, Zn, Mn, and Cu values were monitored with four sampling intervals for 800 d. Acid-base accounting (using total S values) and KCl-extractable Al were also monitored. Iron increased at the 200-d sampling, then dropped at the 600-d sampling to levels found at the beginning of the study. Except for Ca, Fe, Al, and K, all other elements remained relatively constant. This study shows that moderate additions of time will enhance soil conditions so that vegetation can be established on soils containing oxidizing pyrite.

Study sponsored by the U.S. Army Corps of Engineers, Nashville District, with research conducted at Tennessee Technological Univ., Cookeville, TN.

Received for publication August 16, 1989.