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Fate of Nitrogen-15 Applied to Irrigated Acala and Pima Cotton

^a 141 Experiment Station Rd., P.O. Box 345, Stoneville, MS 38776 (previously at: 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 Dep. of Agron. and Range Sci., Univ. of California, One Shields Ave., Davis, CA 95616
^d Univ. of California, Shafter Res. and Ext. Cent., 17053 N. Shafter Ave., Shafter CA 93263

View larger version (42K): [in a new window]   Fig. 1. Fertilizer use efficiency of cotton at defoliation as affected by N treatment. Vertical bars represent standard errors. FUE–15N, fertilizer use efficiency by 15N dilution; FUE-ND, fertilizer use efficiency by N difference.

View larger version (24K): [in a new window]   Fig. 2. Recovery of 15N-labeled fertilizer in Panoche clay loam and Wasco sandy loam after cotton harvest. Horizontal bars represent standard errors.