Editing Soil salinity (section)

==Sodic soils==
When the Na<sup>+</sup> (sodium) predominates, soils can become '''sodic'''. The [[pH]] of sodic soils may be [[acidic soil|acidic]], neutral or [[alkaline soil|alkaline]]. 

Sodic soils present particular challenges because they tend to have very poor structure which limits or prevents [[water infiltration]] and drainage. They tend to accumulate certain elements like [[boron]] and [[molybdenum]] in the [[Rhizosphere|root zone]] at levels that may be toxic for plants.<ref>{{Cite web|title=4. SODIC SOILS AND THEIR MANAGEMENT|url=https://www.fao.org/3/x5871e/x5871e05.htm|access-date=2023-02-08|website=www.fao.org}}</ref> The most common compound used for [[Land reclamation|reclamation]] of sodic soil is [[gypsum]], and some plants that are tolerant to salt and [[ion toxicity]] may present strategies for improvement.<ref>{{Cite book|last=Chesworth|first=Ward|url=https://books.google.com/books?id=EOYYM0-DAGQC&dq=boron+sodium+soil&pg=PA702|title=Encyclopedia of Soil Science|date=2007-11-22|publisher=Springer Science & Business Media|isbn=978-1-4020-3994-2|language=en}}</ref>{{fv|date=July 2023}}

The term "sodic soil" is sometimes used imprecisely in scholarship. It's been used interchangeably with the term [[alkali soil]], which is used in two meanings: 1) a soil with a pH greater than 8.2, 2) soil with an exchangeable sodium content above 15% of exchange capacity. The term "alkali soil" is often, but not always, used for soils that meet both of these characteristics.<ref>{{Cite book|last1=Gupta|first1=S. K.|url=https://books.google.com/books?id=ANCBDwAAQBAJ&pg=PA2|title=Genesis and Management of Sodic (Alkali) Soils|last2=Gupta|first2=I. C.|date=2017-10-01|publisher=Scientific Publishers|isbn=978-93-87869-64-6|language=en}}</ref>