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Cabbage and radish roots lose a lot of their absorption capacity as the temperature drops. As a result, various problems appear and they suffer damage. The most representative of these is chlorosis, where the leaves turn yellow. The causes and symptoms are diverse, so an accurate diagnosis is necessary. If there are still 20 to 30 days left until harvest, you need to take action quickly. If there are less than 20 days left, it may be too late. Please check quickly and minimize damage without suffering. Please check how the symptoms differ by the five causes of nitrogen, sulfur, magnesium, calcium deficiency, and downy mildew, and how to distinguish and take action.