Sorghum and soybean growth as influenced by synthetic pans

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Abstract
Observations were made on the root growth of sorghum and soybeans grown in containers of soil in which one layer was varied in bulk density, thickness and depth from surface. The physical properties of pans were related to the growth of sorghum and soybeans under controlled conditions. With an increase in the bulk density of the compacted layer the root growth was reduced. A bulk density of the compacted layer greater than 1.85 g.cm‐3 affected the root weight. Above the high density layer, roots grew laterally rather than longitudinally. Root growth below the compacted layer was entirely dependent on the root growth in the compacted layer. Root growth was affected not only by the resistance of the compacted layer but also by its depth and thickness.