Leaf area estimation in some species of fruit tree by using models as a nondestructive method.Abstract --Introduction. Leaf area measurements are used commonly in the study of growth and development of fruit trees. These measurements can be made destructively by using a variety of sensitive instruments and/or non-destructively by using models of leaf area estimation. For models of leaf area estimation, some leaf parameters such as the length and width of leaves are usually used in the measurements. Construction of a model of leaf area estimation. Computer programs such as Excel, SAS and SPSS may be used in this process. In brief, after a leaf has been placed on a sheet of paper and photocopied, a digital planimeter or suitable tool may be used to measure the actual leaf area. The leaf width (W) and length (L) of the leaves sampled can be measured by a simple ruler. After this, regression analysis of the data may be performed separately for each genotype, species or cultivar. The analysis can be conducted with various subsets of the independent variables; for instance, leaf length (L), leaf width (W), L 2 , W 2 and [L 2 / W 2 ] to develop the best model for predicting leaf area. Regression analyses should be carried out until the deviation sum of squares is minimized. Models of leaf area estimation for specific crops. In our study, prediction models of leaf area were developed by referring to the relevant current literature that studied such fruits as avocado, banana, blackberry, cacao, cherry, chestnut, grape, guava, kiwifruit, lotus plum, peach, pistachio, rabbiteye blueberry, red currant, red raspberry, sour orange, strawberry, pecan and white mulberry. Advantages and disadvantage of the models of leaf area estimation. Some advantages and a disadvantage of models of leaf area estimation are presented. Conclusion. Our mini-review has shown that the models which have been formulated and which will develop in the future for some fruit species can be reliably used.Turkey / fruit-growing / models / forecasting / leaf area / methods / measurement / evaluation Évaluation non destructive de la surface foliaire de certaines espèces fruitières à l'aide de modèles.Résumé --Introduction. Des mesures de la surface foliaire sont généralement utilisées pour étudier la croissance et le développement des arbres fruitiers. Ces mesures peuvent utiliser des instruments de précision et être destructives et/ou utiliser des modèles permettant l'évaluation de la surface foliaire et être non destructives. Pour ce type de modèle, certains paramètres de la feuille comme la longueur et la largeur des feuilles sont habituellement considérés. Construction d'un modèle d'éva-luation de la surface foliaire. Des programmes informatiques tels qu'Excel, SAS ou SPSS peuvent être utilisés dans ce contexte. Brièvement, après qu'une feuille ait été placée sur du papier et photocopiée, un planimètre numérique ou un autre outil approprié peut être utilisé pour mesurer la surface réelle de la feuille. La largeur de feuille (L) et la longueur (l) des fe...
Improved model for the non-destructive estimation of strawberry leaf area.Abstract --Introduction. Non-destructive estimation of leaf area saves time as compared with geometric measurements. For this reason, several leaf area prediction models were produced for some plant species such as grape, avocado and kiwifruit in previous studies. In this research, we attempted to offer a reliable equation that predicts strawberry leaf area non-destructively by linear measurements of leaf geometry. Materials and methods. An equation was developed by using Sweet Charlie and Camarosa strawberry cultivars and by measuring lamina width, length and leaf area. Results and discussion. It was found that the relationships between the actual leaf area and the predicted leaf area given by the equation developed were significant at a level of 0.1% and that r 2 was 0.993. In addition, the model was validated by measurements of new leaf areas of seven other strawberry cultivars. Conclusions. The model developed could be used for strawberries in relevant studies. Turkey / Fragaria / leaf area index / methods / evaluation / mathematical modelsModèle amélioré pour une évaluation non destructive de la surface d'une feuille de fraisier.Résumé --Introduction. L'évaluation non destructive de la surface d'une feuille est plus rapide que l'utilisation de mesures géométriques. Pour cette raison, diverses études ont proposé des modèles permettant de prévoir la surface des feuilles pour des espèces végétales comme le raisin, l'avocat et le kiwi. Nos recherches ont tenté d'établir une équation fiable apte à évaluer la surface des feuilles de fraisiers à partir d'une méthode non destructive s'appuyant sur des mesures linéaires de la feuille. Matériel et méthodes. Une équation a été développée à partir de l'utilisation des cultivars de fraisiers Sweet Charlie et Camarosa en mesurant la largeur, la longueur et la surface des feuilles. Résultats et discussion. On a constaté que la différence entre la surface réelle de la feuille et sa surface théorique donnée par l'équation mise au point étaient significative au seuil de 0,1 % et que r 2 était égal à 0,993. En outre, le modèle a été validé par la mesure de la surface de feuilles appartenant à sept autres cultivars de fraisiers. Conclusions. Le modèle développé pourrait être utilisé pour des études appropriées sur fraisiers.Turquie / Fragaria / indice de surface foliaire / méthode / évaluation / modèle mathématique
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