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Agronomy Journal Abstract -

Pima Cotton Lint Yield as Influenced by Irrigation Schedule, Cultivar and Altitude1


This article in AJ

  1. Vol. 65 No. 3, p. 498-501
    Received: Aug 14, 1972

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  1. D. L. Kittock2



Development of heat tolerant cultivars of American Pima cotton (Gossypium barbadense L.) made it desirable to re-evaluate irrigation practices for hot climates. To accomplish this, two cultivars and one experimental strain were tested over a period of 6 years at two altitudes (climates) and under several irrigation regimes. There were three basic irrigation regimes and several modifications of them. The regimes were: wet, irrigate every 7 to 12 days; medium, 14 to 17 days; and dry, 21 to 28 days. Individual irrigations were added in amounts necessary to refill the soil profile.

At high altitude (moderate climate), the heat tolerant cultivar, ‘Pima S-4’, did not differ in water requirement from the non-heat tolerant cultivar, ‘Pima S-3.’ Both cultivars obtained maximum lint production with a total of 80 cm of water or five post-emergence irrigations.

At low altitude (hot climate), Pima S-4 yielded higher and required more water (150 cm) than Pima S-3 (115 cm). More frequent irrigations during May and June than are commonly applied were indicated for low altitude. Fewer irrigations than commonly used on Pima cotton during August and September (28 days between irrigations) did not decrease yields and, in some cases, significantly increased yields of all cultivars at low altitude.

Consumptive water use for Pima cotton (103 cm) was similar to that previously reported for Upland cotton (105 cm) when grown under similar irrigation regimes.

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