The Leaching Requirement During Irrigation Essay -- Soil Reclamation A

The Leaching Requirement During IrrigationThe leaching of piddle-soluble salts from the plant rooting zone is a pivotal concern when irrigating cropland. Irrigation irrigate is used to maintain crop productivity, so drought conditions need non occur to induce irrigation measures. Irrigation simply provides supplemental precipitation that may non be achieved through natural processes, i.e. rainfall. Basically, leaching is described as fugitive additional water through a medium to remove unclaimed materials. This is usually achieved through two types of ponding. Additional water is pumped onto the dry land surface and allowed to accumulate until surface ponding occurs. There are two mechanisms that finish this duty, continuous or intermittent ponding. Intermittent ponding, applying the excess water in intervals, is more favorable for milder climates where evaporation rates are low (NATO, 1994). perpetual ponding, applying all the water at once, may not be detach gi ven geographical, climatic, or user-related constraints. Salts accumulate in the scandal profile oer time, therefore, leaching may serve as a form of commonwealth reclamation. Normally, leaching curves are developed to determine the amount of water that may be actually required to reduce the initial bemire salinity by a certain percentage (NATO, 1994). Although rainfall and the introduce soil already have saline concentrations, additional salts are added to the soil via irrigation water. Moisture is then extracted by the processes of evaporation and transpiration, and the salts begin to precipitate. Now, the salt ease of the soil profile changes excessive salt concentrations are introduced without having adequate outlets. If regain it the plants root zone, ... ... Sustainability, Vimieo, Portugal.Rhoades, J.D., J. Loveday (1990) Salinity in Irrigated gardening Irrigation of plain Crops, Agronomy 30, pp. 1107-1103.Schwab, G.O., D.O. Fangmeier, W.J. Elliot, and R.K. F revert (1993) Soil and weewee Conservation Engineering. John Wiley and Sons, Inc. New York pp 395 linked States Salinity Laboratory Staff, Richards, L.A. (ed) (1954) Diagnosis and Improvement of Saline and Alkali Soils, Agriculture handbook No. 60, United States Department of Agriculture pp 37 & 38.Water Quality Technical Committee of the Irrigation & Drainage Division of American golf club of Civil Engineers (1990) ASCE Manuals and Reports on Engineering Practice 71, Agricultural Salinity discernment and Management, pp243-247.Woodard, Guy O. (1969) Sprinkler Irrigation, Sprinkler Irrigation Association Editors Press, Maryland pp 125.