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ABSTRACT
Soil temperature was measured where three tillage systems produced a ridge and furrow microrelief and a smooth soil surface. Corn was planted on ridges, in furrows, and on a smooth surface and with rows running in an east-west or north-south direction. During early growth, corn seedlings were in the warmest soil when the seed was placed in ridges running in an east-west direction and in coolest soil when the seed was placed in a furrow such as that produced by a listing tillage system.
1 Contribution from the Soil and Water Conservation Research Division, ARS, USDA, and the Iowa Agr. and Home Econ. Exp. Sta. cooperating. Journal Paper No. J-4210 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 1486.
2 Formerly Soil Scientist, USDA, and Collaborator, Iowa Agr. and Home Econ. Exp. Sta., Ames; now Research Soil Scientist, USDA, Morris, Minn.
Received for publication June 4, 1962. Accepted for publication September 1, 1962.
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