Saline and Sodic Soils: Characteristics and Properties
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1 Saline and Sodic Soils: Characteristics and Properties DOUGLAS D. MALO, PRESENTING TODAY DAVID E. CLAY, CHERYL L. REESE, SHARON A. CLAY RACHEL OWEN, TULSI KHAREL, GIRMA BIRRU, JOHN GREEN,* TOM M. DESUTTER ** *SOUTH DAKOTA STATE UNIVERSITY, BROOKINGS, SD **NORTH DAKOTA STATE UNIVERSITY, FARGO, ND SALINE/SODIC SOIL MANAGEMENT WORKSHOP REDFIELD, SD JULY 9, 2015 D.D. MALO, SDSU, COPYRIGHT,
2 Outline Definition of the problem Causes of the problem Salt affected classes of soils Lab tests used to identify salt and sodicity problems Current research results Saline Soil Photo Credit: Stacy Turgeon, USDA NRCS DC Sodic (Dispersed) Soil D.D. MALO, SDSU, COPYRIGHT,
3 Why Salt Problems Now? Changes in climate Changes in management More corn and soybeans No till adoption Source of the salts the soil parent materials In typical, normal conditions salts are deeper in soil profiles D.D. MALO, SDSU, COPYRIGHT,
4 Climate Changes Changes in precipitation from 1900 to 2010 in the Northern Great Plains Source changing climate/precipitation change D.D. MALO, SDSU, COPYRIGHT,
5 Next factor that adds to problem: Seasonal water use of tall grass prairie greater than that of corn, soybeans, or wheat. Deep roots of the tall grass that remove water from deeper in the soil profile. Photo, Jim Millar D.D. MALO, SDSU, COPYRIGHT,
6 Changes in Tillage Practices Shift from Conventional to No till Impacts D.D. MALO, SDSU, COPYRIGHT,
7 Source of the Salts Spink County: Areas with till, and lacustrine deposits from Pierre shale Daniels 1987 Upper deposit of Pierre Shale D.D. MALO, SDSU, COPYRIGHT,
8 SD Geology D.D. MALO, SDSU, COPYRIGHT,
9 Glacial Impacts D.D. MALO, SDSU, COPYRIGHT,
10 Glacial Soils Ground Moraine Outwash End Moraine Ground Moraine D.D. MALO, SDSU, COPYRIGHT, 2015
11 Glacial Lake Plain COPYRIGHT 2009, D.D. MALO, PLANT SCIENCE DEPARTMENT, SDSU 11
12 Typical Eastern SD Soil Appearance Horizons Organic Matter distribution Salt location D.D. MALO, SDSU, COPYRIGHT,
13 Genesis of Salt Affected Soils Artesian Water Normal Soils Transpiration loss of water Water and salts move upward due to artesian pressure Capillary rise of water Evaporation losses of water Salt Affected Soils Water Salts Transpiration loss of water Capillary rise of water Normal Soils Impermeable Shales Permeable Sandstone Salts Water Impermeable Shales (Source of salty artesian water) D.D. MALO, SDSU, COPYRIGHT,
14 Precipitation Genesis of Salt Affected Soil Wick Effect Calcareous Parent Material Runoff Capillary and osmotic forces pull water to rim area. Dissolved salts move with the water. Salt Rim Calcareous and saline soils Water and salts move to rim Evaporation losses from the rim areas are greater than from the pond surface. Leached (acid) soils Salt Rim Calcareous and saline Water soils and salts move to rim D.D. MALO, SDSU, COPYRIGHT,
15 Genesis of Salt Affected Soils Saline Seep Precipitation Summer Fallow Water Permeable parent material with soluble salts present Salts Excess water and soluble salts move down in soil until reach impermeable layer. Impermeable parent material with high salt content (e.g., shale) Saline seep area COPYRIGHT 2014, D.D. MALO, PLANT SCIENCE DEPARTMENT, ABS COLLEGE, SDSU Stream 15
16 Development of Salt Sites in Fields 1. Abundance of precipitation in the 1980 s and throughout the 2010 s. 2. Water tables have risen bringing deep old geologic salt concentrations to the surface. D.D. MALO, SDSU, COPYRIGHT,
17 High Water Table and Salts Saline = Calcium / Magnesium Salts Plants will not grow Sodic = Sodium Salts Plants will not grow and soil is dispersed. Commonality between saline and sodic problems is a high water table. Source Reese, 2015 D.D. MALO, SDSU, COPYRIGHT,
18 Saline or Sodic? Note solubility Saline Calcium (Ca) or Magnesium (Mg) Salts (2+) dominate Sodic Sodium Salts (1+) dominate Source Reese, 2015 D.D. MALO, SDSU, COPYRIGHT,
19 Saline Stress: Calcium (Ca) + Magnesium (Mg) Moderately high ph Drought like conditions Poor germination and growth Low nutrient availability Source Reese, 2015 D.D. MALO, SDSU, COPYRIGHT,
20 Sodic Stress: Sodium (Na) Dispersion High ph >8.4 No water movement Erosion Root limitation Source Reese, 2015 D.D. MALO, SDSU, COPYRIGHT,
21 Terms to Know EC (Electrical Conductivity): Measurement of total salts, critical value is 4 ds/m CEC (Cation Exchange Capacity): Soils ability to hold positively charged cations ESP (Exchangeable Sodium Percentage): Sodium (Na+) on soil exchange sites (% Na+ compared to Ca 2+ + Mg 2+ on CEC) ESP > 5 = is considered sodic in SD (previously ESP >15) SAR (Sodium Adsorption Ratio): Measurement of the relative amount of sodium, when compared to total amount of salts (from saturated extracts) Attention SAR > 4 is considered sodic in SD! (previously > 13) NOTE ABOUT SAR: Not as commonly used as ESP because more difficult to do Source Reese, 2015 D.D. MALO, SDSU, COPYRIGHT,
22 Soil Testing Lab Survey Testing Lab Location EC Cation Concentration Sodium Index Iowa State University Ames, IA SP NH 4 OAc SAR North Dakota State University Fargo, ND 1:1 NH 4 OAc SAR University of Minnesota St. Paul, MN 1:1 NH 4 OAc SAR AgLab Express Sioux Falls, SD 1:1 NH 4 OAc ESP AgVise Laboratory Northwood, ND 1:1 NH 4 OAc ESP Minnesota Valley Testing Lab New Ulm, MN 1:1 NH 4 OAc ESP Ward Laboratories Kearney, NE 1:1 NH 4 OAc ESP ServiTech Hastings, NE 1:1 NH 4 OAc SAR Source Owen, 2014 D.D. MALO, SDSU, COPYRIGHT,
23 Results 250 Overall Relationship between EC and TSC Total Soluble Cations (mmole c L -1 ) y = 13.54x R² = 0.88 n = 1245 p-value < EC (ds m -1 ) Source Owen, 2014 D.D. MALO, SDSU, COPYRIGHT, 2015
24 Results Established a linear relationship between EC and TSC: TSC = 13.5*EC Provides a simple way to relate EC to TSC and allows users to more efficiently assess salt affected soils. Allows users to calculate SAR using only EC and Na +. [(EC*13.5) Na + ] = [Ca 2+ + Mg 2+ ] Source Owen, 2014 D.D. MALO, SDSU, COPYRIGHT, 2015
25 Question to ask a soil testing lab How is sodium determined? Saturated paste (SAR) or Ammonium Acetate Extraction (ESP) How was EC determined? Saturated paste or 1:1 extract? Why is this important? Because the EC is used to estimate the total soluble cations (TSC). The TSC is required for the SAR calculation. Source Reese, 2015 D.D. MALO, SDSU, COPYRIGHT,
26 Salt Affected Soil Classes Saline ph<8.4 EC >4 mmhos cm 1 SAR<13, ESP<15% (Arid) SAR <4, ESP <5% (Midwest/Great Plains)* Problem excess soluble salts, reduce water/nutrient availability, plasmolysis, and osmotic forces wwwpub.naz.edu:9000/~bwwitz/ ElodeaafterER.jpg D.D. MALO, SDSU, COPYRIGHT,
27 Salt Affected Soil Classes Sodic ph>8.4 EC<4 mmhos cm 1 SAR>13, ESP>15% (arid) SAR >4, ESP >5% (Midwest/Great Plains)* Problem is high ph due to excess sodium, soluble salts are low, dispersion, reduced air and water movement and reduced nutrient availability Ltpwww.gsfc.nasa.gov/globe/ pvg/columnar.gif D.D. MALO, SDSU, COPYRIGHT,
28 Salt Affected Soil Classes Saline sodic EC>4mmhos cm 1 ph<8.4 (excess soluble salts keep ph low) SAR>13, ESP>15% in arid areas SAR >4, ESP >5% (Midwest/Great Plains) Soil has both high soluble salts and sodium. Soil will become sodic if excess soluble salts are removed. photos/cd1-031.jpg D.D. MALO, SDSU, COPYRIGHT,
29 Salt Affected Soil Classes Normal ph<8.4 EC<4 mmhos cm SAR<13, ESP<15% (arid) SAR <4, ESP <5% (Midwest/Great Plains) No salt problems for most crop and other plants soils.usda.gov/classification/ orders/images/mollisol.jpg D.D. MALO, SDSU, COPYRIGHT,
30 Extent of Salinity D.D. MALO, SDSU, COPYRIGHT,
31 Extent of Sodicity % % 5 10% 1 5% Map: Jim Millar D.D. MALO, SDSU, COPYRIGHT,
32 Economic Impact Source NRCS 2012 D.D. MALO, SDSU, COPYRIGHT,
33 Summary Discussed how saline/sodic soils form Causes for increased areas of saline/sodic soils Basic properties of saline/sodic soils Basic soil properties measured to classify and identify saline/sodic soils D.D. MALO, SDSU, COPYRIGHT,
34 Funding Acknowledgements / Cooperators Natural Resources Conservation Service United States Department of Agriculture (NRCS USDA) Conservation Innovation Grant (CIG Grant) SD Corn Utilization Council SD Soybean Research and Promotion Council South Dakota State University Cooperators Greg Tople, Pierpont, SD Roger Rix, Grant Rix, Andover, South Dakota Jim Millar, Kenny Sehlman, Jerry West, Redfield, SD David Gillen, White Lake, SD D.D. MALO, SDSU, COPYRIGHT,
35 Questions? D.D. MALO, SDSU, COPYRIGHT,
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