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This article in AJ

  1. Vol. 64 No. 6, p. 730-733
     
    Received: Jan 6, 1972
    Published: Nov, 1972


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doi:10.2134/agronj1972.00021962006400060006x

Yield of Flue-Cured Tobacco and Levels of Soil Oxygen in Lysimeters with Different Water Table Depths1

  1. R. B. Campbell and
  2. G. T. Seaborn2

Abstract

Abstract

Flue-cured tobacco (Nicotiana tabacum L.) was grown in lysimeters with static water- table levels at $0, 45, 60, and 90 cm below the soil surface to more clearly define the level at which a favorable balance between soil aeration and water supply is attained. The oxygen and CO2 content of the soil air was determined periodically at various depths. Water-table treatment effects were evaluated in terms of root and shoot growth, yield, and quality of tobacco.

Dry leaf yields for the 90-, 60-, and 45-cm water-table treatments were all significantly (P≥0.05) greater than that for the 30-cm treatment. Yields for the 60- and 90- cm water-table levels were larger, but not significantly (P≥0.05) larger than the 45-cm treatment. The yield difference between the 60- and 90-cm treatments was not significant (P≥0.05). Roots of tobacco recovered from soil above the 60- and 90-cm water tables weighed only 10% more than roots recovered from soil above the 30- cm water table. Average CO2 and O2 gradients in the soil above the water table were nearly equal but of opposite sign. Soil environmental conditions imposed by the 60-cm water-table treatment of this study provided the most favorable balance between aeration and water supply for tobacco.

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