bottom heat

noun Horticulture.
heat artificially applied to a container in which plants are grown in order to induce their germination, rooting, or growth.

1880–85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Treatments will include top vs bottom heat and natural gas vs diesel fuel.
Bottom heat may aid germination, which will occur in about a week.
Use fresh manures only as bottom heat, manure teas for nutrients.
Softwood cuttings taken in spring may be treated with a rooting hormone and
  grown under mist with bottom heat.
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