Rate of change of harvest index

where:

 , rate of change of harvest index (d−1)

, non-stressed rate of change of harvest index (d−1)

Pcr, critical fractional pod-set below which the rate of change of harvest index begins to be reduced from its non-stressed value [parameter]

Ptot, fraction of total yield-determining pods which set (fractional pod set for each high temperature episode on each of the days during the flowering developmental stage NF)

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