HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (5) Citing Articles via Google Scholar Google Scholar Articles by O'Connor, G. A. Articles by Basta, N. T. Search for Related Content PubMed PubMed Citation Articles by O'Connor, G. A. Articles by Basta, N. T. Agricola Articles by O'Connor, G. A. Articles by Basta, N. T.

TECHNICAL REPORT
Plant and Environment Interactions

Bioavailability of Biosolids Molybdenum to Soybean Grain

^a Soil and Water Science Dep., Univ. of Florida, Gainesville, FL 32611-0510
^b Metro. Water Reclamation District Greater Chicago, 6001 W. Pershing Rd., Cicero, IL 60804
^c Dep. of Plant Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078

* Corresponding author (gao{at}ufl.edu)

Received for publication October 16, 2000. Legumes grown in biosolids-amended soils and then fed to ruminants can represent problematic sources of molybdenum (Mo), but few field data are available to quantify the risk. We used a set of fields amended to high cumulative biosolids Mo loads (>18 kg ha^-1) over 27 yr to generate additional data. Soybean [Glycine max (L.) Merr.] was grown on 29 fields (pH values >6.8) amended to a wide range of soil Mo loads. Soybean grain harvested from each field was analyzed for Mo and the concentrations regressed against soil Mo loads estimated from actual soil Mo concentrations in the 0- to 15-cm depth. Slopes of such linear regressions represent uptake coefficients (UC values) used by the USEPA to assess risk of biosolids Mo to ruminants fed forage grown on biosolids-amended land. The UC value for all 29 fields was estimated as 1.66, which agrees with the few soybean grain data in the literature. The UC value, however, is well below a conservative UC value of 4, recently recommended for all fresh legume materials fed to cattle. Soybean grain can contain high concentrations of Mo (>10 mg kg^-1) and have low (<2:1) Cu to Mo ratios, which can exacerbate molybdenosis problems in cattle. However, soybean grain normally constitutes only 10% of dairy cattle diet, and other constituents (e.g., corn grain, stover, mineral supplements) are sufficient, or can be manipulated, to control molybdenosis.

Abbreviations: HEI, highly exposed individual • RPc, reference pollutant load • UC, uptake coefficient

This article has been cited by other articles:

				N. T. Basta, J. A. Ryan, and R. L. Chaney Trace Element Chemistry in Residual-Treated Soil: Key Concepts and Metal Bioavailability J. Environ. Qual., January 1, 2005; 34(1): 49 - 63. [Abstract] [Full Text] [PDF]

				R. C. Stehouwer and K. E. Macneal Effect of Alkaline-Stabilized Biosolids on Alfalfa Molybdenum and Copper Content J. Environ. Qual., January 1, 2004; 33(1): 133 - 140. [Abstract] [Full Text] [PDF]

				G. A. O'Connor, R. B. Brobst, R. L. Chaney, R. L. Kincaid, L. R. McDowell, G. M. Pierzynski, A. Rubin, and G. G. Van Riper A Modified Risk Assessment to Establish Molybdenum Standards for Land Application of Biosolids J. Environ. Qual., September 1, 2001; 30(5): 1490 - 1507. [Abstract] [Full Text] [PDF]