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Root Development of Winter Wheat as Influenced by Soil Moisture and Nitrogen Fertilization¹

Synopsis: Root development of winter wheat was studied in central Nebraska. Depth of soil moisture and rate of nitrogen fertilization were variables. A dense network of roots developed in soil when soil moisture tension was above 15 atmospheres. When moisture conditions were favorable, roots were observed at a depth of 13 feet. There was evidence of moisture depletion to a depth of 8 feet. Nitrogen fertilization increased root weights and moisture utilization at all moisture levels.

² Research Associate; Asst. Agronomist and Agent (Soil Scientist), Soil and Water Conservation Research Branch, A.R.S., U.S.D.A.; Asst. Agronomist; and Asst. Prof. and Agent (Soil Scientist), Soil and Water Conservation Research Branch, A.R.S., U.S.D.A.

Received for publication July 2, 1956.