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Published in Soil Sci Soc Am J 30:723-726 (1966)
© 1966 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Micronutrient Cation Complexing in Soil Solution: II. Complexing of Zinc and Copper in Displaced Solution from Calcareous Soils1

J. F. Hodgson, W. L. Lindsay and J. F. Trierweiler2

ABSTRACT

Zinc deficiencies are generally more widespread on calcareous soils than are Cu deficiencies. The concentration and the degree of complexing of Zn and Cu were measured in the soil solution of 20 calcareous soils from Colorado. The Zn levels in solution were generally less than 2 ppb with rarely more than 75% of the Zn being complexed. Copper levels generally ranged from 5 to 16 ppb in the soil solution with 98 to 99% of the Cu present as organic complexes. Thus, complexing increased the total Cu concentration in solution by a factor of about 100, whereas it increased the total Zn in solution by a factor of 4 or less. Compared to acid soils studied previously, soluble Zn levels were much lower and complexing of Cu was somewhat higher in calcareous soils.

NOTES

1 Contribution from U. S. Plant, Soil and Nutrition Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Ithaca, N. Y., and Department of Agronomy, Colorado State University, Fort Collins, Col. Published with the approval of the Director of the Colorado Exp. Sta. as Scientific Series Paper no. 1115.

2 Soil Scientist, USDA, Associate Professor, Cornell Univ., and Faculty affiliate, Colorado State Univ.; Associate Professor and Graduate Assistant, Colorado State Univ.

Received for publication March 31, 1966. Accepted for publication August 15, 1966.






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