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Response of Irrigated Acala and Pima Cotton to Nitrogen Fertilization

Growth, Dry Matter Partitioning, and Yield

^a Dep. of Agron. and Range Sci., Univ. of California, One Shields Ave., Davis, CA 95616
^b Univ. of California Coop. Ext., 680 N. Campus Drive, Suite A, Hanford, CA 93230
^c Univ. of California, Shafter Res. and Ext. Cent., 17053 N. Shafter Ave., Shafter CA 93263

View larger version (56K): [in a new window]   Fig. 1. Weather data for 1998, 1999, 2000, and the long-term average (1961–1990), including minimum and maximum daily temperature, daily rainfall, and cumulative degree days. Arrows indicate planting and harvest. Plus signs indicate samplings conducted throughout the growing season.

View larger version (23K): [in a new window]   Fig. 2. Effect of N management on lint yield of Acala grown on (A) Panoche clay loam and (B) Wasco sandy loam and (C) Pima grown on Panoche clay loam. Trends or slopes followed by the same letter are not significantly different from each other (P < 0.05). Vertical bars represent standard errors.

View larger version (39K): [in a new window]   Fig. 3. Effect of N management on gin turnout and fiber strength for Acala grown on (A and D) Panoche clay loam and (B and E) Wasco sandy loam and (C and F) Pima grown on Panoche clay loam. Slopes followed by the same letter are not significantly different from each other (P < 0.05). Vertical bars represent standard errors.

View larger version (38K): [in a new window]   Fig. 4. Effect of N management on micronaire and fiber length for Acala grown on (A and D) Panoche clay loam and (B and E) Wasco sandy loam and (C and F) Pima grown on Panoche clay loam. Trends or slopes followed by the same letter are not significantly different from each other (P < 0.05). Vertical bars represent standard errors.