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Example 2 (1).doc.edu - NM 11/01/2008 SALINIZATION: THE...

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NM 11/01/2008 SALINIZATION: THE IMPROPER USE OF WATER Around the world there is today there is a growing deficit of arable land. There are many causes for the disappearance of this land, erosion, urbanization, and salinization. Salinization is a major issue that is affecting every major agriculture area around the globe. Salinization has a much stronger affect on arid lands, which were never meant for heavy or frequent agriculture. Even though salinization affects are felt everywhere, they are most heavily felt in regions where the population is under-educated and poor, or in places where the government does not take the appropriate steps to avoid it. I n t either case , if a water source is not properly taken care it will lead to a detrimental effects , including….salinization,…, to not only that body of water but also the arable lands around it. In order for salinization to occur there has to be salt in one of the many layers of soil. This salt has various different origins. The most common source of salt found in soil is from? the ocean. The ocean transports easily dissolvable salts inland by either entering underground water sources or through storms, floods, rivers, tides, and various other sources. For those areas not near the ocean salt has managed to enter those soils as well. Not through the constant motion of the oceans, but from being deposited there millions of years of years ago by the glaciers that once covered the earth. The salt was deposited and through the years buried beneath many layers of soil. The salt that entered the soil through underground waterways is able to make it through the soils through capillary action. The salt is able to move up through the soil as long as there is room to move between the different minerals in the soils, or if it is helped by evaporation of surface water which makes room for the salt to be able to move (Kovda, Year, 91). Page | 1
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Now i I n order for a soil to be considered salinated, the salt would have had to make it to the upper layer of soil and would have to be in a high enough concentration to interfere with any normal plant growth. The salt can get to the surface in a couple of different ways. Storms and floods can deposit it on the surface, evaporation of surface water can pull the salt up from underlying soil levels, and unlined canals and water storage areas can saturate the various soil levels giving the salt a passage way to the surface. On the salt has permeated the surface layer it is extremely difficult to move the salt back down through the layers of soil. The easiest way is to
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This document was uploaded on 11/04/2011 for the course PWS 150 at BYU.

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Example 2 (1).doc.edu - NM 11/01/2008 SALINIZATION: THE...

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