Symptoms: When the tomato lacks potassium, the middle and upper leaf margins turn yellow, then spread to the mesophyll, and finally browning, withering, and extending to other parts of the leaves, the stems are lignified, no longer thickened, the roots are stunted, and are weaker. The fruit is unevenly ripe, the fruit shape is irregular, the fruit is hollow, and it is softer than normal fruit, lacks the proper acidity, and the fruit taste becomes worse.
Prevention and control measures: First, apply more organic fertilizer. In the application of chemical fertilizers, it should be ensured that the amount of potash fertilizer is not less than 1/2 of the amount of nitrogen fertilizer. Divisional application is encouraged, especially on sandy land. In winter and spring cultivation of protected areas, the lack of sunshine, the ground temperature is often prone to potassium deficiency, pay attention to increase potassium fertilizer.
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