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A Study of Extractable Soil Cobalt in Soils of the Southeastern United States
Author(s) -
Alban L. A.,
Kubota Joe
Publication year - 1960
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1960.03615995002400030017x
Subject(s) - cobalt , soil water , podzol , dithizone , cobalt extraction techniques , chemistry , environmental chemistry , environmental science , soil science , nuclear chemistry , inorganic chemistry
Abstract The relationship between 2.5% acetic acid‐dithizone extractable soil cobalt and the amount of cobalt in black gum leaves, a cobalt indicator, was investigated for 71 widely distributed soils of the southeastern United States. The soil samples were from both good areas and areas where cobalt deficiency in ruminants would be expected on the basis of previous analyses. The extractable cobalt values appeared to separate the Ground‐Water Podzols, the Humic‐Gleys and the Low Humic‐Gleys from the better drained Regosols and Red‐Yellow Podzolic soils studied. At comparable cobalt concentrations in the black gum, the extracted cobalt was less from the imperfectly to poorly drained soils than from the well‐drained soils. For each of the two broad groups of soils, a significant correlation was obtained between extractable soil cobalt for the A 1 horizon and the cobalt concentration in the black gum. Because of the variability in horizon thickness among the different soils, the cobalt values were calculated for the 0‐ to 6‐ and 0‐ to 12‐inch depths. The correlation between these values and plant cobalt was also good. The acetic acid‐dithizone extractable cobalt appears useful in indicating areas of potentially low soil cobalt in the Southeast where deficiency in cattle or sheep might be a problem.