Embed Size (px)
Citation preview
Station 3: Soils Detailed Soil Mapping
Predictive Digital Soil Mapping PDSM
Soil type maps Soil property maps
• Significantly higher spatial accuracy • Show the actual distribution of the soil
types • Increase the speed and accuracy of soil
mapping
If the relationship is known between a soil and its environment then the occurrence of that soil can be predicted in other areas having the same environment.
Station 3 Soils: Wellington County Soil Survey, 1964, 1:63,360
Soil Type = Guelph Loam
Guelph Loam, London Loam, Parkhill Loam, Caledon FSL, Granby SL, Farmington Loam
Station 3 Soils: Parent Materials and Soil Series
Loam till
sand
Loam till
sand
Loam till
sand
Bondhead Loam
Bondhead Siltloam
Dundonald Siltloam
Brighton Siltloam
Loam till
limestonebedrock
Bondhead shallow phase
limestonebedrock
Loam till
Farmington Loam
Station 3 Soils: Mapping Scale Minimum size delineation = 0.5 cm2
Map Scale Dimensions on ground
(m)
Acres on the ground
Average Polygon size
(ac)
1:700 5 .006 0.12
1:20,000 141 5 100
1:25,000 177 8 160
1:50,000 354 31 620
1:63,360 448 50 1000
1:126,720 896 198 4000
PDSM, Raster based 5 m X 5 m Predict a soil type for each raster/grid cell
Ck
Station 3 Soils: Soil Type-Guelph Loam & Donnybrook Gravelly Loamy Course
Sand
Soil Type Soil series – parent material, drainage class, kinds and arrangements of soil horizons (texture, colour, thickness, structure, reaction) + Plow layer soil texture (loam, sandy loam, silt loam, etc. Guelph loam, Guelph sandy loam
Ap
Bm
Ae
Bt
Ck
Ap
Ae
Bt
Ck
Ap
Bt
Ck
Ap Apk
Ck
Profile Changes due to Tillage and Soil and Tillage Erosion
Ap
Apb
Bg
Station 3 Soils: PDSM Mapping How does it work?
• Classification of environmental layers into classes
• Target most representative cells for each class
• Determine soil type at each inspection point
• Develop rule sets to map soil types
Rule base example: Donnybrook gravelly sandy loam degraded Description: Apk, Ck profile developed on relatively dry, stoney, gravelly sands on knolls located at upper and midslope landscape positions • Upper and mid slope (valley depth, midslope, normalized
height) • Dry (topographic wetness index, RHSP) • Knoll (strongly convex- terrain surface convexity, profile and
plan curvature) • Parent Material, stoney, gravelly sand (EM very low reading)
2013 September 4 Imagery, yellow and brown colours
Station 3 Soils: Doug’s Soil Map: Inputs
Soybean September 2013 Relative Hydrological Slope Position
Terrain Classification Index Inspection Points
Station 3 Soils: Woodrill Linders Farm Detailed Predicted Digital Soil Map
Soil_Type
Burford Loam
Disturbed Loam
Donnybrook Gravelly Sandy Loam Degraded
Donnybrook Gravelly Sandy Loam Thick Ap
Donnybrook Gravelly Sandy Loam modal
Donnybrook Loam
Donnybrook Loam Thick Ap
Guelph Fine Sandy Loam
Guelph Loam
Guelph Loam Degraded
Guelph Loam Degraded Thin Ap
Guelph Loam Stony
Guelph fine sandy loam degraded
Linders Loam
Station 3 Soils: Soil Property Mapping
Yield Index
High Above Average Stable
Low Below Average Stable
High, Dry
Low, Wet
Convex
Concave
Up high
Down low
Relative Hydrological Slope Position
Terrain surface convexity
Terrain Classification Index
Soil Fertility Samples
%OM CEC P K Mg pH K:Mg
Avg 3.4 12.6 37 184 268 7.4 .7
Std .5 1.5 12.2 56 64 .3 .2
%CV 15 12 33 30 24 3.5 29
min 1.9 9.1 15 79 123 6.5 .3
max 4.6 17.6 70 352 393 7.9 1.2
Sample Based Mapping, Solim Solutions 2010
Average Soil Fertility Measured Values
Station 3 Soils: Predicted Soil Properties
pH
K Mg Ratio
CEC
Winter Wheat Yield
Predicted P Predicted K
Soybean Yield
Predicted Mg
% Organic Matter
Station 3: Value of PDSM on the farm (Brett Schuyler)
Wausen
Berrien
Fox
Legacy Soil Map Predictive Digital Soil Map (PDSM)
Station 3: PDSM v.s. Yield Brett Schuyler & Tony Balkwill
CORN YIELD 2012 (Drought)
2013 (Above Ave. Rainfall)
36.26 111.34 69.72
67.25 61.82 90.78
58.67 44.8 21.93
562.57 Acres
Station 3: PDSM → Rx Maps Brett Schuyler & Tony Balkwill
Variable Rate Nitrogen
Variable Rate Corn Population
Predictive Digital Soil Mapping so far at Schuyler Farms…
