2 Articles over soil salinization (very important AP topic and this will be on your test)
http://www.smithsonianmag.com/science-nature/earths-soil-getting-too-salty-crops-grow-180953163/?no-ist
http://www.environment.nsw.gov.au/salinity/solutions/irrigation.htm
Respond in the usual 3-2-1 format, and remember that this is an important concept so you really do need to understand it all...
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