The Leaching Requirement During Irrigation Essay -- Soil Reclamation A

The Leaching Requirement During IrrigationThe leaching of soluble salts from the plant prowing partition off is a pivotal concern when irrigating shopland. Irrigation water is used to maintain crop productivity, so drought conditions need not occur to induce irrigation measures. Irrigation entirely provides supplemental precipitation that may not be achieved done graphic processes, i.e. rainfall. Basically, leaching is described as passing additional water through a medium to remove unwanted materials. This is usually achieved through deuce types of ponding. Additional water is pumped onto the soil egress and allowed to hive up until surface ponding occurs. There atomic number 18 two mechanisms that perform this duty, continuous or sporadic ponding. Intermittent ponding, applying the excess water in intervals, is more favorable for milder climates where vaporisation rates are low (NATO, 1994). Continuous ponding, applying all the water at once, may not be appropr iate given geographical, climatic, or user-related constraints. Salts accumulate in the soil profile over time, therefore, leaching may attend as a form of soil reclamation. Normally, leaching curves are developed to determine the amount of water that may be in reality required to reduce the initial soil salinity by a certain percentage (NATO, 1994). Although rainfall and the present soil already impart 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 balance of the soil profile changes unjustified salt concentrations are introduced without having adequate outlets. If located it the plants root zone, ... ... Sustainability, Vimieo, Portugal.Rhoades, J.D., J. Loveday (1990) Salinity in Irrigated Agriculture Irrigation of Agricultural Crops, Agronomy 30, pp. 1107-1103.Schwab, G.O., D.O. Fangmeier, W.J. Elliot, a nd R.K. Frevert (1993) Soil and pee Conservation engineering. John Wiley and Sons, Inc. New York pp 395 unite States Salinity Laboratory Staff, Richards, L.A. (ed) (1954) diagnosing and Improvement of Saline and Alkali Soils, Agriculture handbook No. 60, United States Department of Agriculture pp 37 & 38.Water Quality Technical perpetration of the Irrigation & Drainage Division of American Society of Civil Engineers (1990) ASCE Manuals and Reports on Engineering Practice 71, Agricultural Salinity Assessment and Management, pp243-247.Woodard, Guy O. (1969) Sprinkler Irrigation, Sprinkler Irrigation Association editor in chiefs Press, Maryland pp 125.