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Published in Soil Sci Soc Am J 21:316-319 (1957)
© 1957 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Preliminary Studies of Molybdenum in Illinois Soils1

L. E. Haley and S. W. Melsted2

ABSTRACT

Various methods of extracting molybdenum from soils have been examined and results compared with the total soil molybdenum and plant composition. The reagents employed for extracting molybdenum were 0.1 N NaOH, 0.275 M oxalate, 0.1 N HCl + 0.03 N NH4F, and 0.03 N NH4F. Total molybdenum was determined by a modification of the method of Grigg and Perrin. Plant analyses were made by the method of Johnson and Arkley.

Total molybdenum in the soils studied ranged from 1.90 ppm. to 3.20 ppm. whereas the plant samples ranged from 0.27 ppm. to 10.65 ppm. molybdenum. The following sequence of extraction of molybdenum was observed: 0.1 N NaOH > Tamm's acid ammonium oxalate > 0.03 N NH4F > 0.1 N HCl + 0.03 N NH4F. The only forms of soil molybdenum that gave statistically significant correlations with plant composition were the forms extracted by sodium hydroxide and acid ammonium oxalate.

NOTES

1 This work was submitted by the senior author as part of a thesis in partial fulfillment of the requirements for the Ph.D. degree in the Graduate College, University of Illinois. Published with the approval of the Director, Illinois Agr. Exp. Sta. Presented before Div. IV, Soil Science Society of America, Cincinnati, Ohio, Nov. 12, 1956.

2 Chemist, Pomology Division, Horticulture Department, and Professor of Soils, Agronomy Department, respectively, University of Illinois.

Received for publication January 8, 1957. Accepted for publication February 22, 1957.






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