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Reclamation of salt affected soils

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salt effected soil types and recalamation

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Reclamation of salt affected soils

  1. 1. Types of salt affected soils  Sodic soils  Saline sodic  Saline soils
  2. 2. contain large amounts of water-soluble salts The salts are white, chemically neutral and include the chlorides, sulfates and sometimes nitrates of calcium, magnesium, sodium, and potassium Saline soil
  3. 3. •.. Sodic soils  Soil which have high amount of exchangeable Na  Water intake usually is poor  especially in soils high in silt and clay.  The pH (acidity-alkalinity value) of the soil usually is high, often above nine  plant nutritional imbalances may occur
  4. 4. Reclamation of saline soils Saline soils cannot be reclaimed by any chemical amendment, conditioner or fertilize . Only leaching can remove salts from the plant root zone . The amount of water necessary is related to the initial salt level in the soil , final salt level desired and the quality of the irrigation water.
  5. 5. CONTI…  Adequate drainage prevents salts leached from the surface by irrigation from returning to the plant root zone by upward capillary action .  Regular irrigation and drainage provide successful reclamation of this type of soil
  6. 6. Reclamation of sodic soils . Sodic soils are treated by replacing adsorbed sodium with a soluble source of calcium.  Native gypsum, calcium in irrigation water or commercial amendments can supply the calcium.  Adequate drainage also must be present
  7. 7. Purpose of amendment The purpose of an amendment is to provide soluble calcium to replace exchangeable sodium adsorbed on clay surfaces.
  8. 8. Types of amendment .. There are two main types of amendments: those that add calcium directly to the soil and those that dissolve calcium from calcium carbonate (CaCO3) already present in the soil
  9. 9. Conti..  Calcium amendments include gypsum (hydrated calcium sulfate) and calcium chloride  . Gypsum is moderately soluble in water  Good land management methods prevent salt buildup.  Leveling the land and using heavy irrigation prevents salt accumulation in high spots
  10. 10. Conti..  Acid-forming or acidic amendments include sulfuric acid, elemental sulfur and calcium carbonate-sulfur.  Sulfuric acid reacts immediately with the soil calcium carbonate to release soluble calcium for exchange with sodium.
  11. 11. Conti…  Elemental sulfur must be oxidized by soil bacteria and react with water to form sulfuric acid  . The formation of appreciable amounts of sulfuric acid from elemental sulfur may take several months to several years

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