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Effect of Soil Moisture Tension and Oxygen Concentration on the Growth of Corn Roots¹

Synopsis: Increases in soil moisture tension from 1 through 12 atm. brought about progressively smaller increases in radicle elongation, fresh weight, dry weight, and degree of seedling hydration. Growth properties were most sensitive in the range between 1 and 3 atm. At low moisture stress, oxygen concentration of the root atmosphere needed to be above 10.5% for maximum growth.

² Former Graduate Assistant in Agronomy, Univ. of Illinois, now Assistant Agronomist, Vermont Agr. Exp. Sta.; and Head, Dept. of Agronomy, Univ. of Illinois, respectively.

Received for publication August 2, 1956.

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