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Root Activity Distribution Patterns of Sorghum and Soil Moisture Conditions¹

Synopsis: Relative root activity measurements using P³² uptake and soil-water depletion data show that approximately 90% of root activity of sorghum plants occurred in the top 3 feet. Root growth rates were from 0.75 to 2.0 inches per day.

² Research Chemist and Chief Soil Scientist, U. S. Water Conservation Laboratory, Tempe, Arizona.

Received for publication September 24, 1962.

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