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Summary Non-destructive methods to determine leaf areas are a several models for estimating the leaf area in persim useful tool in plant physiology and agronomy re- mon. A linear model having leaf length x width as the search. Determining the leaf area in persimmon independent variable (LA = 3.83 + 0.69LxW) provided (Diospyros kaki L.f.) involved measurements of leaf the most accurate estimate (R2=0.98, MSE=14, length and width. A two-year investigation was carried PRESS=32843) of leaf area in persimmon in 2006. Val out during 2006 (on twelve genotypes) to develop a idation of this model in 2007 on one other genotype model and in 2007 (on one cultivar) to validate this gave a close correlation and a high R2 indicating that model and to estimate the leaf area across persimmon leaf area may generally be accurately determined from genotypes and environments in Italy. Regression anal- leaf length and width measurements in persimmon, yses of leaf area versus leaf length and width revealed
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Cristofori et al. (2008) studied this question.