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Soil Water Depletion by Irrigated Cotton as Influenced by Water Regime and Stage of Plant Development¹

Synopsis: The period of peak soil water depletion occurred at early bloom. High soil water extended this peak period and increased the rate and amount of water depletion. Although cotton plants may extract water from depths below their primary root zone, the rate of water extraction from these depths may not be sufficient to maintain optimum plant growth during periods of peak demand.

² Soil Scientist, USDA, Ames, Iowa (formerly Weslaco, Texas); Soil Scientist, USDA, Weslaco, Texas; and Associate Soil Physicist, Texas Agr. Exp. Sta., Weslaco, Texas.

Received for publication January 24, 1963.