Accurate and non-destructive methods to determine the plant leaf area are important measurements used in physiological and agronomic studies. This study was aimed to develop the best estimation model in 2017 to determine leaf area in some apple varieties of ‘Summerred’, ‘Mondial Gala’, ‘Golden Delicious’ and ‘Braeburn’ by using leaf length (L), width (W) and combination of the two parameters. Sixteen different models composed of linear and power were obtained. High coefficient of determination denoted R² and low mean square error (MSE) values were used to determine the best models to estimate. Accordingly, combinations of L × W parameters for ‘Summer Red’ and ‘Mondial Gala’ varieties and L × W² for ‘Golden Delicious’ and ‘Braeburn’ varieties were determined as the efficient parameters in estimation of plant leaf area. The results revealed that the plant leaf area can be estimated in an inexpensive, fast and non-destructive manner by mathematical relationships obtained with high R² (‘Summer Red’: 97.9%; ‘Mondial Gala’: 99.1%; ‘Golden Delicious’: 98.6%; ‘Braeburn’: 95.1%) and low MSE (‘Summer Red’: 8.48; ‘Mondial Gala’: 1.594; ‘Golden Delicious’: 0.005; ‘Braeburn’: 0.013) values using leaf dimensions of each variety rather than expensive measurement instruments.

确定植物叶面积的准确和非破坏性方法是生理和农艺研究中使用的重要测量方法。本研究旨在开发 2017 年最佳估计模型，以使用叶片长度 (L)、宽度 (W) 确定“Summerred”、“Mondial Gala”、“Golden Delicious”和“Braeburn”的一些苹果品种的叶面积。以及两个参数的组合。获得了由线性和功率组成的十六种不同的模型。高决定系数表示 R ²和低均方误差 (MSE) 值用于确定要估计的最佳模型。因此，“Summer Red”和“Mondial Gala”品种的 L × W 参数和 L × W ^2的组合对于'Golden Delicious'和'Braeburn'品种被确定为植物叶面积估计的有效参数。^{结果表明，通过使用高 R 2}获得的数学关系，可以以廉价、快速和无损的方式估算植物叶面积（“Summer Red”：97.9%；“Mondial Gala”：99.1%；“Golden Delicious” : 98.6%; 'Braeburn': 95.1%) 和低 MSE ('Summer Red': 8.48; 'Mondial Gala': 1.594; 'Golden Delicious': 0.005; 'Braeburn': 0.013) 使用每个品种的叶子尺寸而不是比昂贵的测量仪器。