The fraction of light intercepted (i.e., incident to photosynthetically active radiation ratio) at midday is calculated according to Beer’s Law:

where ki is the extinction coefficient, GLAI (m2 m-2) is green leaf area index.

The integrated light interception is calculated according to the following equation:

The latter is corrected for possible lodging effect:

where LG_FI_REDUC is an ecotype parameter representing the fraction of reduction in light interception due to lodging (LI_LG_EFF).

The intercepted PAR (MJ m-2 d-1) is then expressed by:

where RADg (MJ m-2 d-1) is daily global radiation, and PAR is assumed to be the 50% of it.

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