Abstract
AbstractCotton root growth and activity was determined at different levels of subsoil bulk density and O2 concentration. Subsoil cores of desired bulk density were aerated leaving both the soil moisture content intact and the surface soil exposed to diffusion of gases from the atmosphere. Measurements of root growth and activity in the subsoils included depth of root penetration, root yield, water uptake, and carbon dioxide production in the subsoil.Mechanical impedance was more detrimental than low O2 for root growth in the subsoils at bulk densities above 1.5 g. cm.‐3. At lower densities root growth was depressed at O2 levels below 10%, and there was a strong interaction of O2 and bulk density.
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