PAR extinction coefficient is estimated by:

This algorithm is defined by three ecotype parameters: EXTCFN (maximum canopy light extinction coefficient), EXTCFST (minimum canopy light extinction coefficient), LFNMXEXT (leaf number, including dead leaves, at which maximum light extinction occurs). TNLFT1 is total number of leaves on the primary tiller. The graph below shows the shape of ki as a with EXTCFN, EXTCFST, and LFNMXEXT.

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