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- Title
Fate of Nitrogen‐15 Applied to Irrigated Acala and Pima Cotton.
- Authors
Fritschi, Felix B.; Roberts, Bruce A.; Rains, D. William; Travis, Robert L.; Hutmacher, Robert B.
- Abstract
Better knowledge on the fate of fertilizer N will aid in developing effective N management strategies balancing plant requirements for optimal lint yield with environmental concerns. Field studies were initiated to determine the fate of 15N fertilizer applied to Acala (Gossypium hirsutum L.) and American Pima (G. barbadense L.) cotton. Four N regimes (56, 112, 168, and 224 kg N ha−1 corrected for residual soil nitrate N levels) were established for Acala cotton grown on a Panoche clay loam [fine‐loamy, mixed (calcareous) thermic Typic Torriorthents] and on a Wasco sandy loam (coarse‐loamy, mixed, nonacid, thermic Typic Torriorthents) in 1998, 1999, and 2000. Pima cotton was evaluated on the Panoche clay loam for the same N regimes in 1999 and 2000. To trace the fate of fertilizer N, 15N‐labeled urea was applied to microplots in selected treatments and years. Acala fertilizer use efficiency by 15N dilution (FUE–15N) averaged 49% on Panoche clay loam and 43% on Wasco sandy loam. Pima FUE–15N on the Panoche clay loam averaged 48% and was not affected by N treatment. Recovery of fertilizer N in the soil was not different between the Panoche clay loam and the Wasco sandy loam in the Acala experiments and combined across both Acala and Pima trials averaged 42%. Averaged across all experiments, more than 75% of the 15N recovered in the soil was found in the top 0.9‐m layer. The total recovery of 15N fertilizer in plant and soil averaged 89% (76–98%) across all treatments, suggesting that production practices employed in this study resulted in only small losses of fertilizer N during the season of application.
- Publication
Agronomy Journal, 2004, Vol 96, Issue 3, p646
- ISSN
0002-1962
- Publication type
Article
- DOI
10.2134/agronj2004.0646