Editing Nutrient sensing (section)

=== Potassium Sensing ===
[[Potassium]] (K+), one of the essential [[Nutrient|macronutrients]] is found in plant soil. K+ is the most abundant cation and it is very limited in plant soil. Plants absorb K+ from the soil through channels that are found at the [[Plasma membrane Ca2+ ATPase|plasma membrane]] of root cells. Potassium is not assimilated into organic matter like other nutrients such as [[nitrate]] and [[ammonium]] but serves as a major osmoticum.<ref name=Cui2012>{{cite journal|title=Nutrient Sensing in Plants | doi=10.1093/mp/sss107 |pmid=23024206 | volume=5|issue=6 |journal=Molecular Plant|pages=1167–1169 | last1 = Cui | first1 = Xiaofeng|year=2012 |doi-access=free }}</ref>