gddcal | R Documentation |
The function calculates the growing season degree days (GDDs) using single/double triangulation/sine methods.
gddcal(tL, tU, tMin, tMax, tMin2 = NULL, method = NULL)
tL |
Lower temperature threshold |
tU |
Upper temperature threshold |
tMin |
Minimum temperature |
tMax |
Maximum temperature |
tMin2 |
Minimum temperature for the second half day |
method |
GDD calculation methods (default = single sine method) |
gddcal
is a function for calculating growing season degree days (GDDs) through four approaches popularly used in agricultural production or relevant fields.
- method = 'stri'
: single triangulation method
- method = 'dtri'
: double triangulation method (need tMin2
)
- method = 'ssin'
: single sine method
- method = 'dsin'
: double sine method (need tMin2
)
The default is the single sine method. i.e., if method
is not specified, gddcal
uses the single sine method. For two double methods ('dtri'
and 'dsin'
), a second half day minimum temperature needs to be specified.
A numeric of growing season degree days (GDDs)
Zalom, F. G., P. B. Goodell, Lloyd T. Wilson, W. W. Barnett, and W. J. Bentley. (1983) "Degree-Days, the Calculation and Use of Heat Units in Pest Management." Division of Agriculture and Natural Resources, University of California. 1-11.
gddprism
## Single Triangulation Method gddcal(55,90,50,82,'stri') ## Double Triangulation Method gddcal(55,90,50,82,45,'dtri') ## Single Sine Method gddcal(55,90,50,82) gddcal(55,90,50,82,'ssin') ## Double Sine Method gddcal(55,90,50,82,45,'dsin')
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.