Abstract
The present study had as objective to determine mathematical equations to estimate the leaf area of pear cv. ‘Triunfo’ using linear dimensions of the leaves. For that, 300 healthy leaves of different sizes from each quadrant of plants from the small farm of Boa Vista located in the city of Montanha, at the northern side of the State of Espírito Santo, Brazil were used. The length (L) along the main vein was measured, along with the maximum width (W) of the leaf blade and observed leaf area (OLA), in addition to the product of the length and width (LW) of each leaf. From these measurements models of linear equations of first degree, quadratic and power were adjusted and their respective R2, using OLA as dependent variable and L, W and LW as independent variable. Based on the proposed equations, the data were validated obtaining the estimated leaf area (ELA). The mean of the ELA and OLA were compared by Student t test 5% probability. The mean error (E), the mean absolute error (MAE) and the root mean squared error (RMSE) was also used as validation criterion. The best equation model was defined based on the non-significant values from the comparison of means of ELA and OLA, E, MAE and RMSE values closer to zero and highest R2. The leaf area of pear cv. ‘Triunfo’ can be estimated by the equation ELA = -0.432338 + 0.712862(LW) non-destructively and with a high degree of precision.
Highlights
The pear tree (Pyrus communis L.) belongs to the faimily of the Rosaceae, being the cv
The determination of leaf area is a fundamental characteristic in studies involving plant development, light interception, photosynthesis efficiency, evapotranspiration, fertilizer and irrigation related responses, being directly related to the yield and quality of the plant (Blanco & Folegatti, 2005)
Indirect methods are based on easy methods to obtain measurements allowing constant measurements of the leaf area, for example during the entire plant development period (Tsialtas & Maslaris, 2005)
Summary
The pear tree (Pyrus communis L.) belongs to the faimily of the Rosaceae, being the cv. ‘Triunfo’ a hybrid with characteristics of fast growth, high productivity, vigorous plants, large fruits of green color, oblong shape and punctuation in the shell, firm flesh and with sweet acidulated taste (Nakasu et al, 2007). The determination of leaf area is a fundamental characteristic in studies involving plant development, light interception, photosynthesis efficiency, evapotranspiration, fertilizer and irrigation related responses, being directly related to the yield and quality of the plant (Blanco & Folegatti, 2005). The measurement of the leaf area can be done directly or indirectly. The direct methods are more efficient, it needs a lot of time, require complex and expensive equipment and are in most cases destructive, preventing successive measurements which often makes their use impracticable (Jonckheere et al, 2004; Pompelli et al, 2012). Indirect methods are based on easy methods to obtain measurements allowing constant measurements of the leaf area, for example during the entire plant development period (Tsialtas & Maslaris, 2005)
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