Tomato yellow top story
1, iron-deficient soil iron is low in absolute content, or more fertilizer, more potassium, more ammonia, more calcium, easily lead to iron deficiency; cultivation temperature is too low, so that the absorption of iron by plants is blocked.
2. Anoxic soil or nutrient solution lacks oxygen, nitric acid is oxidized to nitrous acid, or the soil is seriously acidified, and the conversion from nitrous acid to nitric acid is suspended. Poisoning caused by nitrous acid accumulation also causes yellowing of the top tender leaves.
3. Residual Herbicide Damage If the herbicide Simazine is used in the previous crop, the top leaves will be yellow.
4. Phytotoxicity caused by plastic nutrients The raw materials of plastic nutrients produced by some manufacturers are not standardized, and the chemical components harmful to tomatoes may be mixed in the recycled materials, which may cause yellowing of the top leaves.
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