Editing Hydroponics (section)

===Wood fiber===
[[File:Palha de madeira2.jpg|thumb|upright|Excelsior, or wood wool]]
[[Wood fibre]], produced from steam friction of wood, is an efficient organic substrate for hydroponics. It has the advantage that it keeps its structure for a very long time. [[Wood wool]] (i.e. wood slivers) have been used since the earliest days of the hydroponics research.<ref name=Gericke /> However, more recent research suggests that wood fibre may have detrimental effects on "plant growth regulators".<ref name="woodfibre pgr">{{cite web|url=http://www.purdue.edu/newsroom/research/2010/101025LopezHulls.html|title=Rice hulls a sustainable drainage option for greenhouse growers|last=Wallheimer|first=Brian|date=Oct 25, 2010|publisher=Purdue University|access-date=Aug 30, 2012|archive-date=October 18, 2017|archive-url=https://web.archive.org/web/20171018223549/http://www.purdue.edu/newsroom/research/2010/101025LopezHulls.html}}</ref>{{Primary source inline|reason=This citation is vague in its description of its findings and is in contradiction of more established science suggesting that wood fiber is an adequate media choice. This claim needs a better citation for support.|date=March 2016}}