EnvThes
biogeochemical process
Bottom heat provided by a Propagator or Soil Warming Cable improves germination of seedlings and rooting of cuttings by promoting healthy, vigorous root growth.
[controlled by ] Tomas Staszevski , 2013-06-08 , [source of definition ] http://www.simplycontrol.co.uk/shop/soil_warming/2_39_0_0/default.aspx
soil warming
US LTER controlled vocabulary