Sometimes there is no magnesium deficiency in the soil, but the absorption of magnesium by tomatoes is affected by excessive potassium application or in acidic soils and alkaline soils containing more calcium. Therefore, magnesium deficiency was caused. How to prevent magnesium deficiency in tomato? Symptoms of tomato deficiency magnesium: first appeared in the middle and lower leaves, occurred in the early fruits of the fruit expansion of the leaf first, and gradually expanded to the entire plant. The veins between the main veins and veins are green and the leaf margins remain green. In the late post-fertility, the entire leaves except the veins have been yellowed. Tomato deficiency control measures: increase the temperature and application of organic fertilizer. To determine the soil, magnesium should be added to the soil when magnesium is insufficient. In case of emergencies, 1%-2% magnesium sulfate aqueous solution or dragon light can be used to spray 1500 times of laughter and sprayed 2-3 times a week.
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