Temperatuere
[ temperature | thermal time ]
Temperature
A physical property of a system that underlies the common notions of hot and cold
absolute temperature
centigrade temperature (degrees C)
Fahrenheit temperature (degrees F)
Kelvin temperature
Thermal time
(Black et al. 2006)
Cumulative temperature above a base temperature below which plant development (or germination) ceases, and is often calculated on a daily basis, as follows.
Tt (oC d) = Σ(((Tmax - Tmin)/2) - Tb)
where Tmax and Tmin are the daily maximum and minimum temperatures and Tb is the base temperature.
Data are plotted as the reciprocal of the duration (in days) to x% germination against the mean temperature (T). The inverse of duration (1 d-1) represents the development rate (DR). Least squares regression analysis was used for the positive linear portion of the response whereby:
DR = a1 + b1T
Tb = -a1/b1
and
Tt = 1/b1
References
- Black AD, Moot DJ & Lucas RJ. 2006. Development and growth characteristics of Caucasian and white clover seedlings, compared with perennial ryegrass. Grass and Forage Science 61: 442-453
- seed dormancy (種子休眠)
- seed germination (種子発芽)
- cherry blossom front (桜前線)
- unit ( 単位 )