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Land Disposal of Liquid Sewage Sludge: IV. Effect of Soil Phosphorus, Potassium, Calcium, Magnesium, and Sodium¹

ABSTRACT

Over a 2-year period a total of 6.93, 13.75, 20.0, and 40.0 cm of liquid sewage sludge (6.2% solids) was applied to Coastal bermudagrass (Cynodon dactylon L. Pers.) on Cecil sandy clay loam (Typic Hapludult). The area was sod-seeded to rye (Secale cereale L.) during the winter. A chemical fertilizer treatment supplied a total of 722-177-366 kg/ha of N-P-K to the bermudagrass and rye during the experimental period. Sludge applications resulted in increased Na but decreased the dilute acid-extractable K, Ca, and Mg and had no effect on P. Chemical fertilizer increased P, decreased K, and did not affect Ca and Mg. Results indicate that additions of dolomitic limestone and supplemental K fertilization would be required for sustained productivity of soils receiving sewage sludge.

Key Words: nutrient balance • K and Mg deficiencies • cation leaching

¹ Contribution from the University of Georgia Agr. Exp. Sta., College Station, Athens, Ga. 30601.

² Formerly Graduate Research Assistant, Agronomy Department, University of Georgia, presently Agriculturalist, Tennessee Valley Authority, Muscle Shoals, Ala. 35630 and Professor of Agronomy, University of Georgia, Athens, Georgia, respectively.

Received for publication September 22, 1972.