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 LITERATURE CITED

 1. Boswell, F. C., D. A. Ashley, D. L. Brooks, G. W. Bird, T. D. Canerday,
 J. G. Futral, R. S. Hussey, C. E. Perry, R. W. Ronadori and J. S. Schepers.
 1977. Influence of subsoiling, liming, a nematicide, and soil bedding on
 cotton yield in "stunt" areas of Georgia. Agri. Exp. Sta. Univ. of Ga. Res.
 Bul. 204.

 2. Brill, G. D., R. B. Alderfer, and W. J. Hanna. 1965. Effects of subsoiling
 and deep placement of fertilizer on a coastal plain soil and vegetables.
 Agron. J. 57:201-204.

 3. Jamison, V. C., and P. F. Thornton. 1960. Results of deep fertilization
 and subsoiling on a claypan soil. Agron. J. 51:193-195.

 4. Kashirad, A., C. E. Hutton, J. G. A. Fiskell, and V. W. Carlisle. 1966.
 Tillage pan identification and root growth. Soil and Crop Sci. Soc. Fla.
 Proc. 26:41-52.

 5. Kashirad, A., J. G. A. Fiskell, V. W. Carlisle, and C. E. Hutton. 1967.
 Tillage pan characterization of selected Coastal Plain soils. Soil Sci.
 Soc. Am. Proc. 31:534-541.

 6. Parker, M. G., N. A. Minton, O. L. Brooks, and C. E. Perry. 1976. Soy-
 bean response to subsoiling and a nematicide. Agri. Exp. Sta. Univ. of
 Ga. Res. Bul. 181.

 7. Rhoads, F. M. 1978. Response of soybeans to subsoiling in North Florida.
 Soil and Crop Sci. Soc. of Fla. Proc. 37:151-154.

 8. Rhoads, F. M., and R. S. Mansell. 1978. Effect of water stress and sub-
 soiling on soil-water depletion and grain yield of corn on a sand. Southern
 Branch Amer. Soc. Agron. (Abstracts).

 9. Robertson, W. K., J. G. A. Fiskell, C. E. Hutton, L. G. Thompson, R. W.
 Lipscomb, and H. W. Lundy. 1957. Results from subsoiling and deep fertili-
 zation of corn for 2 years. Soil Sci. Soc. Am. Proc. 21:340-346.

10. Robertson, W. K., C. E. Hutton, and L. G. Thompson. 1958. Response of
 corn in a superphosphate placement experiment. Soil Sci. Soc. Am. Proc. 22:
 431-434.

11. Robertson, W. K., and C. E. Hutton. 1959. Fertilizer placement studies on
 farm crops. Soil and Crop Sci. Soc. of Fla. Proc. 19:190-196.

12. Stibbe, E., and U. Kafkaki. 1973. Influence of tillage depths and P-
 fertilizer application rates on the yields of annual cropped wintergrown
 wheat. Agron. J. 65:617-620.