Editing Hydroponics (section)

===Sheep wool===
[[Wool]] from shearing [[sheep]] is a little-used yet promising renewable growing medium. In a study comparing wool with peat slabs, coconut fibre slabs, perlite and rockwool slabs to grow cucumber plants, sheep wool had a greater air capacity of 70%, which decreased with use to a comparable 43%, and water capacity that increased from 23% to 44% with use.<ref name=":4">{{cite journal |last1=Böhme |first1=M. |last2=Schevchenko |first2=J. |last3=Pinker |first3=I. |last4=Herfort |first4=S. |title=Cucumber grown in sheepwool slabs treated with biostimulator compared to other organic and mineral substrates |journal=Acta Horticulturae |date=January 2008 |issue=779 |pages=299–306 |doi=10.17660/actahortic.2008.779.36 }}</ref> Using sheep wool resulted in the greatest yield out of the tested substrates, while application of a biostimulator consisting of humic acid, lactic acid and Bacillus subtilis improved yields in all substrates.<ref name=":4" />