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Spatial Distribution of Ammonium and Calcium in Optimally Fertilized Pine Plantation Soils

^a Dep. of Agronomy, Purdue Univ., Lilly Hall of Life Sciences, 915 West State Street, West Lafayette, IN 47907-2054
^b Dep. of Forestry and Natural Resources, Pfendler Hall, 715 West State St., West Lafayette IN 47907-2061
^c USDA Forest Service Southern Research Station, Forestry Sciences Lab., P.O. Box 12254, 3041 East Cornwallis Rd., Research Triangle Park, NC 27709

View larger version (29K): [in a new window]   Fig. 1. Standardized, isotropic semivariograms for Ca2+ availability, NH4+ availability, and soil water content in the unfertilized control, fertilized, and fertilized and irrigated (fertigated) plots of SETRES Block 2 in October 2000.

View larger version (53K): [in a new window]   Fig. 2. Point-kriged maps showing spatial distribution of Ca2+ availability in the unfertilized control, optimally fertilized, and optimally fertilized and irrigated (fertigated) plots of SETRES Block 2 in October 2000.

View larger version (50K): [in a new window]   Fig. 3. Point-kriged maps showing spatial distribution of Ca2+ availability in the unfertilized control, optimally fertilized, and optimally fertilized and irrigated (fertigated) plots of SETRES Block 2 in April 2001.

View larger version (75K): [in a new window]   Fig. 4. Point-kriged maps showing the contrasting spatial distributions of NH4+ availability in the optimally fertilized and optimally fertilized and irrigated (fertigated) plots of SETRES Block 2 at the end of the growing season in October 2000 and after manual application of 60 kg urea ha–1 in April 2001.

View larger version (37K): [in a new window]   Fig. 5. Loblolly pine stem diameter size class distributions on optimally fertilized and optimally fertilized and irrigated plots at South Eastern Tree Research and Education Site, North Carolina, in 2000. Data from Albaugh et al. (2004).