果树蔬菜叶片的形状是多种多样的,并且大多不规则。在调查果树冠层结构,测定果蔬营养物质的积累,以及观察它们的叶片生长动态时,都需测定叶面积。 通常惯用的方格法、称重法、求积仪法和光电自动仪法等,均具有不同程度的局限性。而利用我们从实践经验中总结出的公式求算,只需测量叶片的长度和宽度(有时只需其一),代入公式即可求得叶面积。这种简便测法的优点是可在果蔬自然生长状态下进行,不破坏植株整体,并且易于掌握、效率高,准确性也高,可供科研、教学、生产 Fruit tree leaf shape is varied, and mostly irregular. Leaf area measurements are needed to investigate the canopy structure of fruit trees, measure the accumulation of nutrients in fruits and vegetables, and observe the dynamics of leaf growth. Commonly used grid method, weighing method, quadrature method and photoelectric automatic instrument method, have different degrees of limitations. And using the formulas we summed up from the practical experience, we only need to measure the length and width of the blade (sometimes only one), into the formula to get the leaf area. The advantage of this simple and convenient method is that it can be carried out in the natural growth state of fruits and vegetables, does not destroy the whole plant, and is easy to master, high efficiency and high accuracy, and can be used for scientific research, teaching, production