Seasonal Nitrogen Concentration, Uptake, and Partitioning Pattern of Irrigated Acala and Pima Cotton as Influenced by Nitrogen Fertility Level
Felix B. Fritschi*,a,
Bruce A. Robertsc,
Robert L. Travisb,
D. William Rainsb and
Robert B. Hutmacherd
a 141 Experiment Station Road, P.O. Box 345, Stoneville, MS 38776 (Previously at: Department of Agronomy and Range Science, University of California, One Shields Ave., Davis, CA 95616)
b Department of Agronomy and Range Science, University of California, One Shields Ave., Davis, CA 95616
c University of California Cooperative Extension, 680 N. Campus Drive, Ste. A, Hanford, CA 93230
d University of California, Shafter Research and Extension Center, 17053 N. Shafter Ave., Shafter CA 93263

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Fig. 1. Total above ground plant N uptake and partitioning over the growing season in Acala cotton grown on Panoche clay loam in 1998, 1999, and 2000 as affected by N treatment. The control treatment received no N fertilizer while the amount of N applied in the other treatments was determined by subtracting early-season soil nitrate-N levels (top 0.6 m) from the target N levels of 56, 112, 168, and 224 kg N ha1. Vertical bars represent standard errors of means for total above ground N content.
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Fig. 2. Total above ground plant N uptake and partitioning over the growing season in Acala cotton grown on Wasco sandy loam in 1998, 1999, and 2000 as affected by N treatment. The control treatment received no N fertilizer while the amount of N applied in the other treatments was determined by subtracting early-season soil nitrate-N levels (top 0.6 m) from the target N levels of 56, 112, 168, and 224 kg N ha1. Vertical bars represent standard errors of means for total above ground N content.
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Fig. 3. Total above ground plant N uptake and partitioning over the growing season in Pima cotton grown on Panoche clay loam in 1999 and 2000 as affected by N treatment. The control treatment received no N fertilizer while the amount of N applied in the other treatments was determined by subtracting early-season soil nitrate-N levels (top 0.6 m) from the target N levels of 56, 112, 168, and 224 kg N ha1. Vertical bars represent standard errors of means for total above ground N content.
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Copyright © 2004 by the Crop Science Society of America.