Abstract
It is important to appropriately maintain the nutritional condition of the tree in order to stably produce apples with high quality. To appropriately maintain the nutritional condition of the tree, technology that appropriately evaluates the nutritional condition of tree is necessary. In order to enable the simple evaluation of the nitrogen nutrition condition in the production field, the authors devised a technique which evaluates the nitrogen nutrition condition from the value which digitizes the overgrowth of the foliage by image analysis. It was confirmed that the technique was effective as a simple evaluation method of the nitrogen nutrition condition of apple trees. In addition, the value is closely related to the yield and quality of the fruit. So, it seemed to be possible to set the standard value of this value as a goal for ensuring the yield and quality of the fruit.
