Compute Growing Degree Days (GDD)

Compute a common expression of thermal time, the Growing Degree Days (GDD).

Usage

gdd(x, y, a, tb_ct)

Arguments

x

numeric. Minimum temperature.

y

numeric. Maximum temperature.

a

character. Crop name.

tb_ct

matrix. The metadata storing the crop cardinal temperatures.

Value

A vector with the same dimensions as x and y.