Plant availability and uptake of molybdenum as influenced by soil type and competing ions

Journal Article · · J. Environ. Qual.; (United States)

OSTI ID:5504173

Smith, C; Brown, K W; Deuel, Jr, L E

Laboratory and greenhouse experiments were conducted to evaluate the influence of competing ions in the soil solution on the relationship between the sorption of Mo by soils and Mo uptake by grass. Laboratory experiments assessed Mo sorption by Edroy clay, Olmos loamy sand, and Randado sandy loam. Soil treatments included 1, 5, 10, 20, 50, and 100 mg Mo L/sup -1/ added as ammonium molybdate in solutions of 0, 167, 333, and 500 mg L/sup -1/ concentrations of Cl/sup -/ and 0, 226, 451, and 677 mg L/sup -1/ concentrations of SO/sub 4//sup 2 -/ salts. Sorption data fit the Freundlich isotherm. The Olmos soil had the highest CaCO/sub 3/ content and sorbed the most Mo. The Edroy soil had the lowest pH and sorbed the least Mo. The presence of Cl/sup -/ in solution increased Mo sorption, while SO/sub 4//sup 2 -/ reduced Mo sorption in all three soils. In the greenhouse study, soils were treated with 0, 6.5, 13.0, and 26.0 mg Mo kg/sup -1/ soil; 167, 334, and 501 mg Cl kg/sup -1/ soil; and cropped with bermuda grass, Cynodon dactylon (L.)Pers. No toxic symptoms or yield decreases were noted as a result of Mo or salt additions. Plants grown in soil containing 26.0 mg Mo kg/sup -1/ accumulated up to 600 mg Mo kg/sup -1/ dry matter and would be toxic to ruminants. The Mo concentrations in grass grown on the three soils were ranked from highest to lowest as Edroy > Randado > Olmos. Chloride addition to the soil had no significant (P <0.05) effect on bermuda grass Mo content.

• Research Organization: Texas A and M Univ., College Station
• OSTI ID: 5504173
• Journal Information: J. Environ. Qual.; (United States), Journal Name: J. Environ. Qual.; (United States) Vol. 16:4; ISSN JEVQA
• Country of Publication: United States
• Language: English

Related Subjects

510200 -- Environment
Terrestrial-- Chemicals Monitoring &amp; Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560300* -- Chemicals Metabolism &amp; Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL AVAILABILITY
CHLORIDES
CHLORINE COMPOUNDS
ECOLOGICAL CONCENTRATION
ELEMENTS
GRASS
HALIDES
HALOGEN COMPOUNDS
METALS
MOLYBDENUM
OXYGEN COMPOUNDS
PH VALUE
PLANTS
PRODUCTIVITY
SOILS
SORPTIVE PROPERTIES
SULFATES
SULFUR COMPOUNDS
SURFACE PROPERTIES
TRANSITION ELEMENTS
UPTAKE