Crop vernalization

Vernalization is defined as the low temperature promotion of flowering. Thermal time accumulation is limited until vernalization requirements are met. A vernalization factor that takes on values from 0-1 to adjust thermal time as calculated based on the following parameters. These parameters are only relevant for winter crops.

Crop vernalization page

Vernalization checkbox

This checkbox enables vernalization. When disabled, the vernalization parameters have no effect.

Low temperature threshold for optimum vernalization (C)

The low end threshold temperature above which vernalization accumulation is optimum.

High temperature threshold for optimum vernalization (C)

The high end threshold temperature below which vernalization accumulation is optimum.

Vernalization requirement to start (days)

The sum of vernalization-days at which the vernalization factor is set to a minimum and starts increasing towards 1.

Vernalization day requirement to complete (days)

is the sum of vernalization-days at which the vernalization requirement is completed.

Minimum vernalization factor (0-1)

The value of the vernalization factor at the beginning of the vernalization process. This parameter should be set to zero if the vernalization-days required to start parameter is set larger than zero; otherwise, it must be set greater than or equal to zero.