Leaflet length and width were used to calculate leaflet area, lateral leaflet area, and trifoliolate area for strawberry, Fragaria × ananassa Duch. ‘Redcoat’ and genotypes 62E55 and 71M59. Using regression analysis, the product of length and width (LW) was chosen as the independent variable. On the basis of predictive ability ( R 2 ) and/or the SE of estimation, the following equations were chosen to determine leaflet area, lateral leaflet area, and trifoliolate area, respectively: A = 0.66LW + 0.89; A = 0.68LW; A = 0.69 ΣLW. A common regression equation could be used for the cultivar and genotypes studied. If the leaf is unequally imparipinnate, then the area of the lateral leaflets and the trifoliolate must be summed to obtain total leaf area.
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Strik et al. (1985) studied this question.