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Proceedings Paper

Mapping soil attributes for site-specific management of a Montana field
Author(s): John P. Wilson; Damian J. Spangrud; Melissa A. Landon; Jeffrey S. Jacobsen; Gerald A. Nielson
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Paper Abstract

Conventional soil maps represent the distribution of soil attributes across landscapes but with less precision than is needed to obtain the full economic and environmental benefits of site- specific crop management. This study quantifies the spatial variability of three agronomically significant soil attributes: (1) thickness of mollic epipedon, (2) organic matter content (OM), and (3) pH as related to soil survey map units, spectral data, and terrain attributes for a 20 ha field in Montana. Analysis of Order 1 (1:7920-scale) Soil Survey map units indicates substantial variation in all three soil attributes. There was some evidence that similar attribute values were clustered in the field (0.40 - 0.46 Moran's Coefficients). Two spectral band ratios explained 64% of the variation in OM across the field. GPS/GIS-derived wetness index, sediment transport index, elevation, and slope gradient explained 48% of OM variation. Wetness index, slope gradient, and plan curvature combined to explain 48% of the variation in mollic epipedon thickness. Elevation and wetness index explained just 13% of pH variation. Two spectral band ratios, specific catchment area, and wetness index combined to explain 70% of the variation in OM at 66 sampling sites. Four contour map representations of OM illustrate the sensitivity of the final maps to variations in input data and interpolation method.

Paper Details

Date Published: 6 January 1995
PDF: 12 pages
Proc. SPIE 2345, Optics in Agriculture, Forestry, and Biological Processing, (6 January 1995); doi: 10.1117/12.198897
Show Author Affiliations
John P. Wilson, Montana State Univ. (United States)
Damian J. Spangrud, Montana State Univ. (United States)
Melissa A. Landon, Montana State Univ. (United States)
Jeffrey S. Jacobsen, Montana State Univ. (United States)
Gerald A. Nielson, Montana State Univ. (United States)

Published in SPIE Proceedings Vol. 2345:
Optics in Agriculture, Forestry, and Biological Processing
George E. Meyer; James A. DeShazer, Editor(s)

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