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Responses of Glasshouse Grown Cotton to Irrigation with Carbon Dioxide-Saturated Water

USDA-ARS Western Cotton Res. Lab., 4135 E. Broadway Rd., Phoenix, AZ 85040

^* Corresponding author.

Experiments were conducted to test the suitability of using irrigation water as a carrier for CO₂ to enhance growth and productivity of cotton (Gossypium hirsutum L.). Potted plants (‘DPL 61’) were irrigated daily with CO₂-saturated water in a greenhouse in Phoenix, AZ. Growth, productivity, and physiological responses of these plants were compared to those irrigated with deionized water. All plants were fertilized twice weekly with a modified Hoagland's solution. Yield as measured by boll load at maturity was increased 70 and 53% in two sets of experiments. Carbon dioxide exchange rate (CER) was increased 38%. Leaf chlorophyll content and starch content were also increased. None of the carbon in lint samples was derived from the CO₂ in the irrigation water. Leaf Zn and Mn were deficient in the control plants but were sufficient in the plants watered with CO₂-saturated water. The CO₂-saturated irrigation water increased uptake of Zn and Mn, which supported a more robust photosynthetic apparatus in the treated compared to the control plants. The greater photosynthetic activity during boll loading resulted in a significant increase in yield of the treated plants.

Received for publication March 28, 1987.

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