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Toxic Metals in Acid Soil: II. Estimation of Plant‐Available Manganese
Author(s) -
Hoyt Paul B.,
Nyborg Marvin
Publication year - 1971
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/sssaj1971.03615995003500020021x
Subject(s) - manganese , chemistry , hordeum vulgare , brassica , soil water , extraction (chemistry) , base (topology) , soil ph , horticulture , agronomy , poaceae , mathematics , biology , chromatography , organic chemistry , ecology , mathematical analysis
Manganese in 40 acid surface soils was measured by eight methods and statistically compared with the concentrations of Mn in barley ( Hordeum vulgare L.), turnip rape ( Brassica campestris L.), and alfalfa ( Medicago sativa L.) grown on the soils in a greenhouse study. Of the eight methods, a 16‐hr extraction with 0.01 M CaCl 2 gave by far the best estimate of plant‐available Mn, the correlation coefficients being 0.76, 0.73, and 0.86 between Mn extracted from the soil and the concentrations of Mn in barley, rape, and alfalfa, respectively. Another form of soluble Mn, that extracted by 0.1 N HOAc, gave the next best estimate of plant‐available Mn. The other five extraction methods, consisting of 0.1 N H 3 PO 4 or 0.002 N HCl for soluble Mn, 1 N KCl or 1 N NH 4 OAc (pH 3) for exchangeable Mn, and 0.2% hydroquinone in 1 N NH 4 OAc (pH 7) for easily reducible Mn, gave fair to poor estimates of available Mn. Total Mn gave a poorer estimate than did any of the methods used for extractable Mn. On arranging the soils in two groups of equal number, having pH ranges of 4.15–5.14 and 5.15–5.63, good measurements of available Mn in both groups were given by only the 0.01 M CaCl 2 method. Manganese in the three plant species was correlated with soil pH but not with percent base saturation. Besides being related negatively to soil pH, Mn in the plants also was related positively to total soil Mn and negatively to soil exchange capacity as shown by multiple regression analyses.