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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

View larger version (26K): [in a new window]   Fig. 1. A, B, and C represents 19-ha study Site I, 35-ha study Site II, and 28-ha study Site III respectively, showing regions of site-specific management zones and georeferenced soil sample locations. [Low soil productivity = white; Medium soil productivity = light gray; High soil productivity = dark gray.] Fields are not to scale.

View larger version (62K): [in a new window]   Fig. 2. Krigged surfaces for sand, silt, clay, organic C, soil moisture, and bulk density for study Site II. Management zones are superimposed (black lines) over each image to show the relationship of the soil properties to each management zone.

View larger version (33K): [in a new window]   Fig. 3. Box plots of soil properties that were significantly different among the low, medium, and high management zones at study Site I (A, B, C, and D), Site II (E, F, G, and H), and Site III (I through N). Boxes within plots with same letter are not significantly different at 0.05 probability level.