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Response of Grain Sorghum to Seedbed Compaction¹

Various degrees of compaction were carried out prior to and immediately after planting a summer crop of sorghum under conditions of dryland farming. Soil physical properties—bulk density, penetrability, air permeability and surface cracking—were affected appreciably only to a depth of 15 cm. Preplanting compaction significantly reduced seedling emergence and yields. Postplanting treatments increased sorghum stand density and yield significantly.

² Soil Physicist, Div. of Soil Technology; Senior Lecturer in Soil Physics and Head, Div. of Soil Technology; and Associate Professor of Agronomy and Director, The Volcani Institute of Agricultural Research.

Received for publication September 28, 1965.