Editing Calcium deficiency (plant disorder) (section)

==Treatment==
[[File:Blossomrotcloseup.jpg|thumb|Dissection of grape tomato with blossom end rot]]
Calcium deficiency can sometimes be rectified by adding [[agricultural lime]] to acid soils, aiming at a [[Soil pH|pH]] of 6.5,<ref name=":0" /> unless the subject plants specifically prefer acidic soil. Organic matter should be added to the soil to improve its moisture-retaining capacity.<ref name=":0" />  However, because of the nature of the disorder (i.e. poor transport of calcium to low transpiring tissues), the problem cannot generally be cured by the addition of calcium to the roots.<ref name=":0" />  In some species, the problem can be reduced by prophylactic spraying with [[calcium chloride]] of tissues at risk.<ref name="Rot" />

Plant damage is difficult to reverse, so  corrective action should be taken immediately, supplemental applications of [[calcium nitrate]] at 200 ppm nitrogen, for example. Soil [[pH]] should be tested, and corrected if needed, because calcium deficiency is often associated with low pH.<ref>{{Cite web|url=https://www.spectrumanalytic.com/support/library/ff/Ca_Basics.htm|title=Calcium Basics|website=www.spectrumanalytic.com|access-date=2017-03-22}}</ref><ref>{{Cite news|url=http://www.greenersideoflife.com/uncategorized/diagnosing-and-treating-calcium-deficiencies/|title=Diagnosing and treating Calcium Deficiencies|date=2016-05-20|work=Greener Side Of Life|access-date=2017-03-22|language=en-US|archive-url=https://web.archive.org/web/20170322203619/http://www.greenersideoflife.com/uncategorized/diagnosing-and-treating-calcium-deficiencies/|archive-date=2017-03-22|url-status=dead}}</ref>{{Citation needed|date=February 2008}}
<ref>{{cite news |last1=John |first1=Elex |title=Tomato Mentor |url=https://tomatomentor.com |access-date=8 August 2021}}</ref>
Early fruit will generally have the worst symptoms, with them typically lessening as the season progresses. Preventative measures, such as irrigating prior to especially high temperatures and stable irrigation will minimize the occurrence.