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Cotton Growth and Yield as Affected by Taproot Diameter Within a Simulated Restraining Soil Layer¹

Synopsis: Radial restraint of cotton taproots was studied using plastic clamps to simulate zones of high soil strength. All treatments affected plant vigor and appearance, plant height, stem diameter, and lint cotton yield. A root diameter of about 0.65 centimeter was necessary to bring plants to full maturity.

² Research Soil Scientists, Southern Plains Branch, SWC, ARS, USDA, Southwestern Great Plains Field Station, Bushland, Tex., and U.S. Big Spring Field Station, Big Spring, Tex., respectively, and Soil Scientist, Southern Plains Branch, SWC, ARS, USDA, U.S. Big Spring Field Station.