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Soil Quality Map - NERA Final Analysis
The final soil quality map incorporates soil erosion andsoil heath to determine the final rankings per HU foroverall soil quality.The four categories within soil erosion and soil healthwere given points from 1 - 4, with 4 being given to thetop category. These points were then summed to createthe final soil quality map as reflected.
Soil Erosion - Final AnalysisInput Layers
1. Water Erosion - USLE2. Wind Erosion - WEQ3. Erodibility Index - Water4. Erodibility Index - Wind
Soil Erosion analysis incorporates the Input Layers shown to the left.Each layer was weighted and summed to create the final HU rankingas shown in this map. This map will then be incorporated into the Soil Health Analysis Map.
Final HU Ranking
2002 AgCen CRP/WRP Acres By County
Acres0 - 69556956 - 1571515716 - 3030230303 - 89189
Reference Map
Soil ErosionBase LayerComponent
Nebraska Resource Assessment
USLE on Cropland1.0000 - 1.09821.0983 - 1.24221.2423 - 1.43321.4333 - 2.3692
AnalysisWeight
80100120140
1. Water Erosion - USLE NERA used NRCS National Resources Inventory Universal Soil Loss Equation (USLE) data from 1997. A ranking of each HU based on the soil erosion in relation to the soils Tolerable (T) level of soil loss. NERA 2 emphasizes the cropland within a huc that has significant soil loss. CRP acres are not included in the analysis. Weight: HIGH Ranking with greater concern for greater soil loss in relation to T.
Water Erosion - USLEBase Data
Soil ErosionBase LayerComponent
Nebraska Resource Assessment
AnalysisWeight
80100120140
2. Wind Erosion - WEQ NERA used NRCS National Resources Inventory Wind Erosion Equation (WEQ) data from 1997. A ranking of each HU based on the soil erosion in relation to the soils Tolerable (T) level of soil loss. NERA 2 emphasizes the cropland within a huc that has significant soil loss. CRP acres are not included in the analysis. Weight: HIGH Ranking with greater concern for greater soil loss in relation to T.
Wind Erosion - WEQBase Data
WEQ on Cropland1.0000 - 1.07161.0717 - 1.26161.2617 - 1.63281.6329 - 2.1212
Percent of HU
100120140
80
AnalysisWeight
3. Erodibility Index - Water NERA used NRCS National Resources Inventory Erodibility Index (EI) data from 1997. A ranking of each HU based on the EI on cultivated cropland. FINAL NERA RANKING = (Current Soil Loss Ranking) * (Potential Soil Loss Ranking)
Soil ErosionBase LayerComponent
Nebraska Resource Assessment NERA 2 - Water Erosion Related to T* Water Erosion Index
0.00 - 2.612.62 - 4.964.97 - 8.498.50 - 18.80
Percent of HU
100120140
80
AnalysisWeight
Soil ErosionBase LayerComponent
Nebraska Resource Assessment
4. Erodibility Index - Wind NERA used NRCS National Resources Inventory Erodibility Index (EI) data from 1997. A ranking of each HU based on the EI on cultivated cropland. FINAL NERA RANKING = (Current Soil Loss Ranking) * (Potential Soil Loss Ranking)
NERA 2 - Wind Erosion Related to T* Wind Erosion Index
0.86 - 3.263.27 - 7.027.03 - 11.5411.55 - 23.07
320 - 340341 - 380381 - 420421 - 480
Soil Health Final Map
Soil Salinity Soil QualityBase LayerComponent
Nebraska Resource Assessment
4. Soil Salinity NERA 2 used NRCS County Soil Survey Geographic Database (SSURGO) county total estimated acres of map units with Electrical Conductivity (EC) greater than 4.0.
HU RankingNo Saline SoilsSaline Soils
AnalysisWeight
020
LOW Weight
Percent HUC Cropped Fields 2004 Soil ErosionBase LayerComponent
Nebraska Resource Assessment
Percent HU Cropland NERA 2 used FSA 2004 Digitized Field boundary data to determine the number of cropped field acres within each HU. These acres do not include CRP fields.
Input LayersOrganic Matter, Soil Erosion, Soil Salinity, No Till, Acidic Soils, Alkaline Soils
Reference Maps
LOW Weight2004 No Till Soil Erosion
Base LayerComponent
Nebraska Resource Assessment
6. Soil Carbon Sequestration NERA 2 used FSA 2004 Digitized Field boundary data to determine the number of cropped field acres within each HU. From this, CTIC 2004 No Till Acres were subtracted. This gave the number of acres per HU that were not under the No Till Conservation Tillage practice. The percent of these acres per HU are reflected in this map. These acres do not include CRP fields.
% of HU0.565046340 - 17.720781817.7207819 - 37.079125237.0791253 - 57.778006457.7780065 - 90.3643137
AnalysisWeight
16202428
Soil Erosion Analysis Soil ErosionBase LayerComponent
Nebraska Resource Assessment
2. Soil Erosion Analysis Final Soil Erosion Analysis.
MEDIUM Weight
Final HU Ranking240 - 260261 - 280281 - 320321 - 360
AnalysisWeight
40506070
Soil Alkalinity Soil ErosionBase LayerComponent
Nebraska Resource Assessment
Percent of HU
0.02 - 8.718.72 - 23.1123.12 - 41.1741.18 - 89.83
AnalysisWeight
16202428
3. Soil Alkalinity NERA 2 used NRCS County Soil Survey Geographic Database (SSURGO) county total estimated acres of map units with pH greater than 7.8 on cropped fields.
LOW Weight
LOW WeightSoil Acidicity Soil Erosion
Base LayerComponent
Nebraska Resource Assessment
7. Acidic Soils NERA 2 used NRCS County Soil Survey Geographic Database (SSURGO) county total estimated acres of map units with pH less than 6.0.
% of HU0 - 16.5316.54 - 45.1145.12 - 71.6671.67 - 97.26
AnalysisWeight
16202428
Final HU Ranking150 - 184185 - 216217 - 250251 - 290
2002 AgCen CRP/WRP Acres By County
Acres0 - 69556956 - 1571515716 - 3030230303 - 89189
HIGH WeightOrganic Matter Soil Erosion
Base LayerComponent
Nebraska Resource Assessment
1. Soil Organic Matter NERA 2 used the SSURGO Soils data to determine soil organic matter content. Those soils with an Organic Matter Content of < 0.9 were identified. The number of acres of these soils were then identified within the cropped fields from FSA Field Boundary data from 2004. This map reflects the HU's with the greatest number of cropped fields that contain the least amount of organic matter. within the surface layers of the soil horizon. The % of these soils within each HU were determined.
% of HU Organic MatterLess than 2.0
AnalysisWeight
80100120140
0.02 - 2.982.99 - 8.418.42 - 18.6718.68 - 42.97
Input Data Layers: Soil Erosion, Soil Health
Low Concern
High Concern
Map Date: June 2005USDA NRCS Nebraska
Final HU Ranking
Map is not appropriate forlocalized interpretation.
This map is to be used for areato area (hydro unit to hydro
unit) comparisons only.
