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Direct Observation of Cotton Root Growth under Field Conditions¹

Under favorable soil chemical and physical conditions, cotton primary roots elongated 3.3 times as fast as stems up to July 13. At that time roots had reached the 170-cm depth, the maximum depth at which observation could be made. The period of maximum root proliferation coincided with the maximum rate of plant height increase and occurred during the period immediately following initiation of the reproductive cycle. There were no identifiable periods of suspense in root extension until the onset of final cessation of root growth. This occurred following maturation of first boll set.

Key Words: taproot elongation • aeration

² Research Soil Scientists, Soil and Water Conservation Research Division ARS, USDA, Auburn, Ala.

Received for publication January 15, 1968.