HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Fahad, A. A. Search for Related Content PubMed Articles by Fahad, A. A. Agricola Articles by Fahad, A. A.

Movement of Manganese-54 in Calcareous Soils as Affected by Leaching Solution, Lime Content, Salinization, and Sterilization¹

ABSTRACT

Movement of ⁵⁴ Mn was investigated in calcareous soil columns (untreated, partially depleted lime, salinized, and sterilized) leached with 0.05 mol CaCl₂ L^–1 followed by 0.03 mol EDTA L^–1 (ethyle-nediaminetetraacetic acid). Manganese was monitored along the soil columns using gamma spectrometry and measured in the effluent during the leaching course (80–120 d). Results indicated that the leaching with CaCl₂ for 45 d left 63, 32, and 10% of the applied Mn in the upper 0.5 cm of the silty clay, loam, and loamy sand soils, respectively, with no Mn detected below 5.0 cm. Conversely, leaching with EDTA for 4 d resulted in a nearly uniform distribution of Mn in the 20-cm soil columns. The various soil treatments caused a reduction in the retention capacity of the three soils for Mn with the maximum reduction occurring in the soils with partially depleted lime. In most cases, leaching with CaCl₂ for 45 d produced no Mn in the column effluent except negligible amounts of Mn that were displaced from the sterilized and 50 g lime kg^–1 columns. On the other hand, Mn emerged in the effluent immediately after EDTA application and continued until the end of the leaching course. The shape and the position of the breakthrough curves varied depending on the specific soil treatment.

¹ Contribution from the Faculty of Agriculture and Biology, Nuclear Research Center, P.O. Box 765, Baghdad, Iraq.

² Soil Scientist, Faculty of Agriculture and Biology, Nuclear Research Center, P.O. Box 765, Baghdad, Iraq.

Received for publication July 7, 1986.