The gross photosynthesis rate (t ha-1 d-1) is derived from PARCE (g MJ) and IPAR (MJ m-2 d-1), and it is influenced by possible lodging effect through the adimensionless factor PARCE_LG_EFF:

where LG_GP_REDUC is an ecotype parameter representing the fraction of photosynthesis reduction due to lodging.

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