Confalonieri's approach

A daily factor accounting for spikelet sterility due to cold shocks during the period between panicle initiation and heading is calculated (see developmental stages in Crop development) as derived by the investigations of Kakizaki and Kido (1938) reported by Nishiyama (1995):

where Tthresh (°C) is the threshold temperature below which cold-induced sterility damages are caused, Th (°C) are the hourly temperatures, DVS11 is the DVS of the 11th day before heading (DVS code = 1.75), γ and δ are variety-specific coefficients used to discriminate among varieties which are sensitive for few or many days around the 11th day before heading (midpoint of time elapsed from panicle initiation and heading).

The integral of factor SterilityF is a reduction factor of PanicleAGBd.

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