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The Relationship of Soils to Molybdenum Toxicity in Grazing Animals in Oregon¹

ABSTRACT

Molybdenum toxicity in ruminant animals is a soil-related nutritional problem on wet floodplains of some small streams in Oregon. The soils of these floodplains have large amounts of Mo (2 to 6 ppm) inherited from their parent materials. The Mo content of legumes increased with increases in the Mo content of calcareous soils formed in granitic alluvium. In highly-leached acid soils from shales, the plant content did not increase consistently, but the amounts in the plant were still within the toxic range (10 to 20 ppm) for grazing animals.

Key Words: ruminants • plant

¹ Joint contribution from the Soil Conservation Service USDA, the US Plant, Soil and Nutrition Laboratory, Soil and Water Conservation Research Division, ARS, USDA, and the Oregon Agr. Exp. Sta., Oregon State University. Corvallis (technical paper no. 2096). Presented before Div. S-4, Soil Science Society of America, Columbus, Ohio, Nov. 2, 1965.

² Research Soil Scientist, SCS, Ithaca, N. Y.; Soil Scientist, ARS, Ithaca, N. Y.; Associate Professor, Oregon State University; and State Soil Scientist, SCS, Oregon, respectively. The authors gratefully acknowledge the support given this study by J. R. Haag, Oregon State University.

Received for publication January 9, 1967. Accepted for publication May 11, 1967.