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Soil Fertility & Plant Nutrition

Spatial Variability of Measured Soil Properties across Site-Specific Management Zones

^a Lecturer, Dep. of Agricultural Engineering and Landuse Planning, Private Bag 0027, Botswana College of Agriculture, Gaborone, Botswana
^b Associate Professor, Dep. of Soil and Crop Sciences, Colorado State Univ., Fort Collins, CO 80523-1170
^c Research Associate, Dep. of Soil and Crop Sciences, Colorado State Univ., Fort Collins, CO 80523-1170
^d Professor, Dep. of Forest, Range, and Watershed Stewardship, Colorado State Univ., Fort Collins, CO 80523
^e Professor, Dep. of Forest, Range, and Watershed Stewardship, Colorado State Univ., Fort Collins, CO 80523
^f Professor, Dep. of Forest, Range, and Watershed Stewardship, Colorado State Univ., Fort Collins, CO 80523

^* Corresponding author (rkhosla{at}colostate.edu)

The spatial variation of productivity across farm fields can be classified by delineating site-specific management zones. Since productivity is influenced by soil characteristics, the spatial pattern of productivity could be caused by a corresponding variation in certain soil properties. Determining the source of variation in productivity can help achieve more effective site-specific management. The objectives of this study were (i) to characterize the spatial variability of soil physical properties across irrigated corn (Zea Mays L.) production fields and (ii) to determine if soil physical properties could explain the variability in productivity between site-specific management zones. The study was conducted over three study sites in northeastern Colorado. The soil properties measured were bulk density, cone index, surface soil color, organic C, texture, sorptivity, and surface water content. A multi-response permutation procedure was used to test for significant differences among soil properties between management zones. Box plots of soil physical properties were created for each management zone within each study site to determine if trends in soil physical properties corresponded to the productivity potential of the management zones. Overall, this study showed that soil physical properties exhibited significant spatial variability across production fields. The trends observed for the measured soil physical properties corresponded to the productivity potential of the management zones. Utilizing site-specific management zones could help manage the in-field variability of yield-limiting soil physical properties.

Abbreviations: DGPS, differentially corrected global positioning system • GIS, geographic information system • GPS, global positioning system

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				D. Inman, R. Khosla, R. Reich, and D. G. Westfall Normalized Difference Vegetation Index and Soil Color-Based Management Zones in Irrigated Maize Agron. J., January 11, 2008; 100(1): 60 - 66. [Abstract] [Full Text] [PDF]