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Adsorption and Extractability of Molybdenum in Relation to Some Chemical Properties of Soil¹

ABSTRACT

Development of a practical soil test for molybdenum (Mo) will depend on selection of the proper extractant. To achieve this, more knowledge is needed about Mo adsorption and its extractability, especially in relation to other soil properties.

Adsorption of Mo from aqueous solutions was determined for eight soils from the Atlantic Coastal Plain and Piedmont regions. The data followed the Freundlich isotherm more consistently than the Langmuir. Adsorption increased as the organic matter and/or Fe oxide contents of the soils increased. Adsorption from an aqueous solution that was initially 0.3 mM Mo (AdMo) also was determined on 32 soils collected from the regions. The AdMo level was positively correlated with Fe oxide and organic matter contents and negatively correlated with pH and P levels.

The level of Mo extracted with acid ammonium oxalate (Grigg Mo) and an anion exchange resin (resin Mo) were also determined and related to soil chemical properties and a lime treatment. Grigg Mo was positively correlated with amorphous and free Fe oxide contents, probably as a result of the strong dissolution of Fe oxide by oxalate. Resin Mo was positively correlated with pH but not with other soil properties. Incubating soils with CaCO₃ increased the level of resin Mo.

¹ Paper no. 5584 of the Journal Series of the North Carolina Agric. Exp. Stn., Raleigh, NC 27650. The scholarship provided to the senior author by the Ministry of Science and Higher Education, Tehran, Iran and Pahlavi University, Shiraz, Iran is gratefully acknowledged.

² Former Graduate Student and Professor of Soil Science, respectively. The senior author is presently Assistant Professor, Dep. of Soil Science, College of Agriculture, Pahlavi University, Shiraz, Iran.

Received for publication March 20, 1978. Accepted for publication May 30, 1978.

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