Spatial Variability of Coastal Plain Soil Physical Properties: Implications for Site-Specific
Management. (5366)
Authors:
M. Duffera* - NC State University J.G. White - NC State University R. Weisz - NC State University
Abstract:
Soil classification and mapping may capture the spatial variability of soil physical properties, and thus may be useful in the development of soil and crop management zones. Spatial variability of soil physical properties was characterized for use in N management and water quality research for Southeastern Coastal Plain soils. The experiment was carried out in a 12 ha NC Coastal Plain field with Goldsboro (Go), Lynchburg (Ly) and Norfolk (No) soils. Relatively undisturbed soil core samples were obtained to about 1 m depth and were sectioned into appropriate depth
increments. Sample segments of 7.6 cm diameter by 7.6 cm high cores from depths of 4 to 12, 20 to 28, 38 to 46, 54 to 62, and 70 to 78 cm were taken and analyzed in the laboratory for saturated hydraulic conductivity, soil water retention, bulk
density, porosity, and soil texture. Data was analyzed using proc mixed model approach. Semivariogram ranges for all soil properties varied from 30 to 70 m depending on soil depth. Significant differences in sand, silt, and clay content; soil water retention, saturated hydraulic conductivity were observed among the soil map units to a depth of 45 cm. Goldsboro and Norfolk soil series exhibits similar
properties as compared to the Lynchburg series which suggests that soil
management approaches for Go and No could be similar. This result shows that soil map units appear to be reasonable starting points for developing management zones in Coastal Plain soils.
Speaker Information: Miressa Duffera, NC State University, Department of Soil Science Box 7619, Raleigh, NC 27695-7619; Phone: 919-513-4636; E-mail:
Session Information: Monday, November 1, 2004, 1:30 PM-3:30 PM Presentation Start: 1:30 PM (Poster Board Number: 2555)
Keywords: soil physical properties; soil moisture; precision agriculture; soil mapping units
