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Studies in Soil Manganese: II.: Extractable Manganese and Plant Uptake
Author(s) -
Salcedo I. H.,
Ellis B. G.,
Lucas R. E.
Publication year - 1979
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/sssaj1979.03615995004300010026x
Subject(s) - manganese , chemistry , soil water , glycine , nuclear chemistry , zoology , environmental chemistry , amino acid , biochemistry , soil science , biology , environmental science , organic chemistry
Results from a greenhouse pot experiment with 12 Michigan and Indiana soils of different characteristics were used to evaluate effectiveness of six extractants in predicting Mn uptake by soybean ( Glycine max. , cv. Hark) plants. Three levels of Mn as MnSO 4 were added to each soil. Correlation between extractable Mn and uptake of Mn by plants decreased in the following order: 0.1 N H 3 PO 4 > steam/1 N NH 4 OAc > 1.5 M NH 4 H 2 PO 4 > 0.1 N HCl > 1 N NH 4 OAc > 0.005 M DTPA. Inclusion of pH and (Ca+Mg)/K ratio in prediction equations for each soil test increased percentages of variation in uptake data explained by the tests. Of the soil characteristics, Mn oxide fractions explained 66% of the variation in Mn uptake; inclusion of pH, bases ratio and total Mn in the equation accounted for 82% of this variation. Critical levels of extractable Mn in these soils were 12 ppm for 0.1 N H 3 PO 4 and 14 ppm for steam/1 N NH 4 OAc or 1.5 M NH 4 H 2 PO 4 .