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Root Distribution of Some Irrigated Crops Using Undisrupted Soil Cores¹

Synopsis: In irrigated areas where a "plowsole" layer existed, a large percentage of plant roots were found to occupy the first foot of soil and especially the first 6 inches. The number and size distribution of roots per increment of soil depth gave a better comparison between different crops from the standpoint of soil physical properties than a comparison of root weights alone.

² Associate Professor of Soil Physics, Department of Agronomy, College Station; Associate Agronomist; and Superintendent, Lower Rio Grande Valley Exp. Sta., Meslaco, Texas, respectively.

Received for publication November 3, 1957.