Photo Period

The response to photo-period is approximated with a linear relation of day length (DL, h), which fluctuates from 0 and 1, multiplicative of growing degree days accumulated in the course of crop development.

For long-day crops:

For short-day crops:

where DLins (h) is day length for insensitivity, DLif (h) is day length to inhibit flowering. The photo-periodic factor fluctuates between 0 and 1 within the two critical day-length thresholds.

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