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Relative Effects of Acid Subsoils on Cotton Yields in Field Experiments and on Cotton Roots in Growth-Chamber Experiments¹

Field experiments were conducted with cotton on Norfolk, Magnolia, and Greenville soils where previous treatments had established different subsoil acidity levels at each test site. The surface soil of each plot was differentially limed wth a very fine lime to adjust its pH within the range of 6.0 to 6.5. Bulk subsoil samples were obtained from representative plots at each subsoil pH level, and the rate of early cotton root growth was measured with short-term experiments in a controlled environment. Yields in the field experiments were considerably less sensitive to subsoil acidity differences than were cotton roots in the controlled environment. Maximum cotton yields in the field were obtained on soils in which the rate of root growth indie subsoils during short-term experiments was only 1/2 to % of the maximum rate. The data suggest that maximum yields in die field are realized from a root system mat proliferates in the subsoil at a rate considerably below its potential.

² Professor of Soils, Research Soil Scientist, and Soil Scientist.

Received for publication March 30, 1967.

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