New Zealand Journal of Agricultural Research abstracts
Cobalt and manganese relationships in New Zealand soils
Z. LI
R. G. MCLAREN
Soil and Physical Sciences Group
P.O. Box 84
Lincoln University
Canterbury, New Zealand
A. K. METHERELL
AgResearch
c/o Soil and Physical Sciences Group
P.O. Box 84
Lincoln University
Canterbury, New Zealand
Abstract Total soil concentrations of cobalt (Co) and
manganese (Mn) were determined in a range of pastoral soils sampled from four
different regions of New Zealand. Concentrations of Co and Mn extracted from
soils with 0.02 M Na2H2EDTA (pH 7.0 ) and with 0.05 M CaCl2 were
also determined, and, in the case of Co, were determined using both air-dried
and field-moist samples. Relationships between total and extractable soil Co
and Mn concentrations, and other soil properties, were examined by means of
statistical correlation and regression analysis. There were significant
correlations between total and EDTA-extractable Co and Mn in both top- and
subsoils, indicating a strong geochemical association between Co and Mn in
soils during their development. As assessed by CaCl2 extraction, there were
only small proportions of soil Co and Mn present as soluble and exchangeable
forms in New Zealand soils. It was observed that soluble Co and Mn
concentrations could be reasonably well predicted from soil pH and the
respective EDTA-extractable metal concentrations. Air-drying of soils increased
CaCl2-extractable Co concentrations by an average of five-fold, indicating the
likely sensitivity of soluble soil Co concentrations to soil water potential.
Keywords air-drying; CaCl2-extraction; cobalt;
EDTA-extraction; manganese; soil pH
New Zealand Journal of Agricultural Research, 2001, Vol. 44: 191-200
0028-8233/01/4402&3-0191 $7.00/0 (c) The Royal Society of New Zealand
2001
PDF file of entire paper: medium quality (745K); (scanned from paper original: notes about this process)
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