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Published in Soil Sci Soc Am J 37:371-374 (1973)
© 1973 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Phosphorus Application Rate, Soil Properties, and Leaching Mode on 32P Movement in Soil Columns1

T. J. Logan and E. O. McLean2

ABSTRACT

Movement of 32P-labeled monocalcium phosphate was investigated in column experiments with P application rate, P-fixation capacity, and mode and intensity of leaching as variables. Three soils of contrasting texture and P-fixation capacity were studied. Leaching of P increased with P application rate and intensity of leaching. Constant head leaching resulted in greater movement of 32P out of the surface layer and greater accumulation in the leachate than intermittent leaching. In general, 32P recovered in the leachate was nonionic except in instances where maximum leaching occurred. Significant amounts of 32P were recovered in the leachate only with sandy loam soil and at the highest P application rate.

NOTES

1 Published with the permission of the Director of the Ohio Agr. Res. and Dev. Center as Journal Article 19–72. Presented before Div. S-2 Soil Science Society of America, New York City, Aug. 19, 1971. This work was supported by a grant from the Office of Water Resources, Ohio State Univ. Data in this paper are from the Ph.D. Dissertation of the senior author Ohio State University, 1971.

2 Former graduate student, now Assistant Professor and Professor, The Ohio State Univ., and the Ohio Agr. Res. and Dev. Center, respectively.

Received for publication September 18, 1972. Accepted for publication January 26, 1973.






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