In addition to soil analysis, visual observation of plants can provide valuable information. Farmers should pay attention to leaf coloration, shoot shape, and fruit size. A proper diagnosis may include assessing the age of yellowing leaves, as older leaves tend to show deficiency symptoms first. Furthermore, it is recommended to monitor the overall growth of the tree, observing whether there is a reduction in the production of new shoots and flowers, which can be an early indicator of nutritional problems. Avocado leaves that exhibit uniform yellowing are typically a sign of nitrogen deficiency in corn.
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