Calculates the first derivative of the Geeraerd's model at a given time for the model parameters provided and the environmental conditions given.
numeric vector indicating the time of the experiment.
list with the values of the variables at time t.
parameters for the secondary model. No explicit check of their validity is performed (see section Model Parameters).
a function that provides the temperature at a given time.
This function is compatible with the function
A list with the value of the first derivatives of N and C_c at time
dN/dt = - N * k_max * α * γ
dC_c/dt = - C_c * k_max
α = 1/(1+C_c)
γ = 1 - N_res/N
k_max = 1/D_T
log(D_T) = log(D_R) + (T_R-T)/z
temp_ref: Reference temperature for the calculation,
D_R: D-value at the reference temperature,
z: z value,
N_min: Minimum value of N (defines the tail).
To define the Geeraerd model without tail, assign
N_min = 0.
For the model without shoulder, assign
C_0 = 0
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