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Published in Soil Sci Soc Am J 25:497-499 (1961)
© 1961 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Effect of Surface Soil Thickness on Corn Yields: II. As Determined by an Experiment Using Normal Surface Soil and Artificially-Exposed Subsoil1

O. P. Engelstad and W. D. Shrader2

ABSTRACT

In an experiment involving corn yield responses to rates of nitrogen fertilizer on artificially exposed Marshall subsoil and normal surface soil, results were obtained in 1958 and 1959 which indicated that equal corn yields could be obtained on either surface or subsoil, provided that adequate nitrogen fertilizer was supplied. Maximum corn yields on both subsoil and normal soils were approximately 100 bushels per acre in 1958 and 125 bushels per acre in 1959. Yields on subsoil control plots (0 N) were 45 to 50 bushels per acre lower than from corresponding surface soil plots. A regression analysis of the data indicated that the production of maximum corn yields on subsoil required 35 more pounds of nitrogen per acre in 1958 and 52 more pounds of nitrogen per acre in 1959 than on normal soil. Nitrogen availability in the untreated surface soil exceeded that in the untreated subsoil by the equivalent of about 70 to 75 pounds of fertilizer nitrogen per acre per year.

NOTES

1 Journal Paper No. J-3991 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Iowa. Project No. 1266.

2 Former Research Associate, now Agronomist, Soils and Fertilizer Research Branch, TVA, Wilson Dam, Ala., and Associate Professor of Soils, respectively.

Received for publication December 21, 1960. Accepted for publication March 10, 1961.






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