Estimativa de área foliar em genótipos de morangueiro

Abstract

The strawberry (Fragaria x ananassa) originated in Europe, but today it is cultivated worldwide, and due to its nutritional characteristics, flavor and aroma, it is one of the most exploited fruits in Brazil. Strawberry has great socioeconomic importance due to the considerable number of producers in its various production scales, generating employment for a large number of field workers. The leaf area index is a biophysical parameter that, besides being related to the photosynthetic process, is widely used in physiological studies involving growth analysis, transpiration, and in research to quantify damage caused by pests and leaf diseases. The objective of this work was to obtain mathematical models for the non-destructive estimation of the leaf area different strawberry genotypes, based on the linear dimensions of the leaves, trefoil length, trefoil width, the product of trefoil length x trefoil width and central leaflet width. To evaluate the performance of the models, the statistics used was the root mean square of error (RQME) and the regression determination coefficient (R2). Using the data, 4 models were obtained to estimate the strawberry leaf area, which presented high determination coefficients, R² > 0.70. The higher the R2 value and the lower the RQME value, the higher the accuracy of the model. The model that used the CT x LT as independent variable presented higher R² value than the models that used only one of the dimensions, LT or CT, indicating that the estimation of the strawberry leaf area by the product of the linear dimensions, CT x LT, is the most adequate in relation to the other variables used, in all the genotypes tested.