Difference between revisions of "Thermal constant"

From Glossary of Meteorology
imported>Perlwikibot
(Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == thermal constant == </div> <div class="definition"><div class="short_definition">(<br/>''Al...")
 
imported>Perlwikibot
Line 9: Line 9:
 
   </div>
 
   </div>
  
<div class="definition"><div class="short_definition">(<br/>''Also called'' thermometric constant.) The quantity of [[heat]] required to complete  some stage, or the whole, of a plant's growth.</div><br/> <div class="paragraph">It was first investigated by R&eacute;aumur about 1735, using the sum of the mean daily temperatures.  It may also be measured by the sum of air temperatures above some standard such as 42&deg;F (<br/>''see''  [[degree-day]]). In modern [[agricultural climatology]] this concept has been largely abandoned in  favor of complex influence factors such as [[evapotranspiration]]. It has also been established that  soil temperatures at or somewhat below 10 cm are more important for plant growth than [[air  temperature]].</div><br/> </div>
+
<div class="definition"><div class="short_definition">(''Also called'' thermometric constant.) The quantity of [[heat]] required to complete  some stage, or the whole, of a plant's growth.</div><br/> <div class="paragraph">It was first investigated by R&#x000e9;aumur about 1735, using the sum of the mean daily temperatures.  It may also be measured by the sum of air temperatures above some standard such as 42&#x000b0;F (<br/>''see''  [[degree-day]]). In modern [[agricultural climatology]] this concept has been largely abandoned in  favor of complex influence factors such as [[evapotranspiration]]. It has also been established that  soil temperatures at or somewhat below 10 cm are more important for plant growth than [[air  temperature]].</div><br/> </div>
 
</div>
 
</div>
  

Revision as of 16:18, 20 February 2012



thermal constant

(Also called thermometric constant.) The quantity of heat required to complete some stage, or the whole, of a plant's growth.

It was first investigated by Réaumur about 1735, using the sum of the mean daily temperatures. It may also be measured by the sum of air temperatures above some standard such as 42°F (
see degree-day). In modern agricultural climatology this concept has been largely abandoned in favor of complex influence factors such as evapotranspiration. It has also been established that soil temperatures at or somewhat below 10 cm are more important for plant growth than air temperature.


Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.