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Recovery of Residual Fertilizer-N and Cotton Residue-N by Acala and Pima Cotton

^a 9611 S. Riverbend Ave., Parlier, CA 936438
^b Dep. of Agronomy and Range Science, Univ. of California, One Shields Ave., Davis, CA 95616
^c Dep. of Plant Science, California State Univ. Fresno, 2415 E. San Ramen Ave., Fresno, CA 93740
^d Univ. of California, Shafter Research and Extension Center, 17053 N. Shafter Ave., Shafter CA 93263

View larger version (25K): [in a new window]   Fig. 1. Recovery of fall incorporated (Acala in 1998; Pima in 1999) 15N-labeled aboveground cotton residue N by Acala and Pima cotton in the next growing season (Acala: 1999; Pima: 2000) or the second growing season since residue application (Acala: 2000) as affected by N treatment. Bars indicate standard errors of three (Pima) or four (Acala) replicates.

View larger version (31K): [in a new window]   Fig. 2. Recovery of fertilizer–15N applied in the spring of 1998 (Acala) or 1999 (Pima) and remaining in soil and root component or cycled back in aboveground cotton residue (residue) at the end of the season, by cotton grown in the 1999 (Acala) and 2000 (Acala and Pima) seasons. Bars indicate standard errors of three (Pima) or four (Acala) replicates.

View larger version (28K): [in a new window]   Fig. 3. Acala fertilizer–15N recovery in microplots labeled either in the soil and root component or amended with labeled aboveground cotton residue. In microplots with labeled belowground components, fertilizer was applied in spring 1998, labeled cotton residue was exchanged with nonlabeled residue at the end of the 1998 season, and recovery in the soil was determined after harvest in 1999 and 2000. In microplots amended with 15N-labeled aboveground cotton residue in the fall of 1998, recovery was determined after harvest in 2000. Bars indicate standard errors of four replicates.

View larger version (25K): [in a new window]   Fig. 4. Fertilizer–15N recovery in Panoche clay loam of microplots labeled either in the soil and root component or the aboveground residue component. Pima cotton was fertilized in spring, and aboveground residue exchanges were made in the fall of 1999. Soil samples were collected after Pima harvest in 2000. Bars indicate standard errors of three replicates.