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The mean labor time of a leaf (hour/day−1) is defined as the ratio of mean daily photosynthetic rate of a leaf (Da; mol m−2 day−1) to the mean value of potential hourly photosynthetic rate (60 ⋅ 60Amax mol m−2 h−1) of the leaf. A model was proposed to estimate mean labor time of leaves. Mean labor time was obtained as the product of 24 (hours/day−1) and the four effects, each of which reduces production...
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