1. Tim Hull Environmental Pedology
Description & Interpretation of Two Soils In Lake and Orange Counties, Florida
Tim Hull
Environmental Pedology

2. Soil No. 1 - Lake County, FL Sub-Tropical Climate
Average Annual Rainfall ≈ 51”
Average Temperature
Month
High
Low
January 74 50
July 90 72

3. Soil No. 1 Landscape Position: Knoll on marine terrace
Mt. Dora, Lake County, FL
Soil No. 1
Landscape Position:
Knoll on marine terrace

4. Soil No. 1 Elevation ≈ 125’ Contour Elevations
Contour elevations indicate knolls

5. Soil No. 1 - Soil Survey Soil No. 1 Mapped as an Arent
Sample has horizon development
Imprecision due to scale
Map Unit Nos. 8
Map Unit No.
Map Unit Name 8
Candler sand, 0 to 5 percent slopes 9
Candler sand, 5 to 12 percent slopes 17
Arents 9
NRCS Web Soil Survey maps this spot as 17 – Arents (Arents do not have diagnostic horizons because they have been deeply mixed by plowing, spading, or other methods of moving by humans. Although the S, W, and E sides of the hill were disturbed, the N side was relatively undisturbed (railroad and Perkins sign aside). As we’ll see later, the profile had developed horizons, which led me to believe this soil is not an Arent (possibly part of the map unit 9 – Candler Sand, 5% to 12% slopes (measured slope was 9%) adjacent to the N.) The imprecision of the map unit boundaries is related to problems of scale when creating the soil maps. 17
Soil No. 1

6. Profile Description:
Ap cm; brown (10YR 5/3) sand; single grained; loose; many fine roots; abrupt wavy boundary.
E cm; very pale brown (10YR 7/4) sand; single grained; loose; many fine roots; clear wavy boundary.
Bt cm; red (2.5YR 5/8) sandy loam; moderate subangular blocky structure; friable; few fine roots; gradual wavy boundary.
Bt cm; red (2.5YR 5/8) sandy loam; moderate subangular blocky structure; friable; common prominent white (10YR 8/1) and yellow (10YR 8/8) areas of depletion; gradual wavy boundary.
Bt cm; white (2.5Y 8/1) loam; strong subangular blocky structure; very friable; many red (2.5YR 5/8) areas of iron accumulation.

7. Ap Ap E E E
Bt1
Bt1

8. Bt1
Bt2
Bt2
Bt3

9. Relict redox (ped from Bt3)

10. Soil No. 2 - Seminole County, FL
Sub-Tropical Climate
Average Annual Rainfall ≈ 51”
Average Temperature
Month
High
Low
January 72 50
July 92

11. Soil No. 2 Seminole County, FL Landscape Position: Floodplain
(Econlockhatchee River)

12. Soil No. 2 Elevation ≈ 10’ Contour Elevations 25
Contour elevations indicate knolls 25
Contour Elevations

13. Soil No. 2 - Soil Survey Soil No. 2
Profile characteristics don’t match characteristics of major map unit components
Imprecision due to scale
Map Unit Nos. 18 20
Map Unit No.
Map Unit Name 11
Basinger and Smyrna fine sands, depressional 18
Malabar fine sand 20
Myakka and EauGallie fine sands 28
Pompano fine sand, occasionally flooded 29
St. Johns and EauGallie fine sands 99
Water 29
Basinger requires mucky sand component. Neither Basinger nor Smyrna descriptions mention a clay layer. 99 11 28
Soil No. 2

14. Profile Description:
Ap--0-1 cm; very dark gray (10YR 3/1) sand; single grained; loose; many medium and coarse roots; abrupt smooth boundary.
E--1-2 cm; light brownish gray (10YR 6/2) sand; single grained; loose; many fine roots, few medium and coarse roots; abrupt smooth boundary.
Bh cm; very dark gray (10YR 3/1) sand; single grained; loose; many fine roots; few dark reddish brown (2.5YR 3/3) soft masses of iron accumulation; gradual smooth boundary.
BE cm; dark reddish brown (5YR 3/4) sand; single grained; loose; common fine roots; common dark red (2.5YR 3/6) soft masses of iron accumulation and common dark yellowish brown (10YR 4/4) areas of depletion; gradual wavy boundary.
E cm; brownish yellow (10YR 6/6) sand; single grained; loose; common fine roots; few yellowish red (5YR 5/8) soft masses of iron accumulation; smooth wavy boundary.
E cm; pale yellow (2.5Y 7/3) sand; single grained; loose; few fine roots; many yellowish red (5YR 5/8) soft masses and pore linings of iron accumulation; abrupt wavy boundary.
Bt cm; dark yellowish brown (10YR 4/4) sand; single grained; loose; few yellowish red (5YR 5/8) soft masses and pore linings of iron accumulation; many yellowish brown (10YR 5/6) areas of depletion; gradual wavy boundary.
Bt/Btg cm; dark yellowish brown (10YR 4/4) sand; single grained; loose; common prominent very coarse gray (5YR 5/1) and many prominent coarse pale yellow (2.5Y 7/3) areas of depletion; gradual wavy boundary.
Btg cm; reddish gray (2.5YR 5/1) clay; moderate subangular blocky structure; very friable; many yellowish red (5YR 5/8) soft masses and pore linings of iron accumulation; few prominent very coarse pale brown (10YR 6/3) areas of depletion.

15. Ap E Bh

16. E Bh

17. Bh BE E1

18. BE Closeup E1

19. BE E1
Depleted Matrix E2

20. E1
Redox as soft masses E2 Bt

21. Homogenous zones of Btg in Bt matrix
Redox as soft masses Bt
Bt/Btg
Homogenous zones of Btg in Bt matrix

22. Homogenous zones of Btg in Bt matrix
Bt/Btg
Btg had higher chroma than appears in photo!!!
Homogenous zones of Btg in Bt matrix
Btg

23. Gray colors due to reduction of Fe and anaerobic conditions
Bt/Btg
Gray colors due to reduction of Fe and anaerobic conditions
Depletions
Btg
Would meet def. of Depleted Matrix
Redox as soft masses

24. Redox Con. As Pore Linings (from Btg)

25. Comparison of Soil Forming Factors
Soil No.1
Soil No.2
Parent Material
Alluvium
Climate
Organisms
No worms
Some worms
Topography
6-12%
2-6%
Time

26. Soil Properties Soil Property Soil No. 1 Soil No. 2 Infiltration Rate
High
Available Water Capacity
Moderate
Low
Hydraulic Conductivity
Depth to SHWT
>150cm
<25cm

27. Site Characteristics Characteristic Soil No.1 Soil No.2
Position of Site
Upland
Floodplain
Parent Material
Alluvium
Slope
6-12%
2-6%
Surface Runoff
Medium
Erosion Potential
Low

28. Ultisol (assuming <35% BS)
Soil Classification
Classification
Soil No.1
Soil No.2
Epipedon
Ochric
Subsurface Horizon
Argillic
Spodic
Order
Ultisol (assuming <35% BS)
Spodosol

29. Soil Interpretations Soil Interpretation Soil No.1 Soil No.2
Dwellings Without Basements
Slight
Moderate
Septic Tank Absorption Fields
Local Roads & Streets

30. Questions?