Tomato iron deficiency symptoms: young leaves yellow, grayish yellow spots appear at the base of the leaves, spread outward along the veins, and sometimes between the veins of dry and dead, the symptoms from the top to the stem and leaf development, in the axillary buds also grow yellow veins of leaves.
Prevention and control measures: When the soil pH reaches 6.5-6.7, the use of alkaline fertilizers and the use of physiological acidic fertilizers are prohibited. When there is too much phosphorus in the soil, deep plowing, soil and other methods can be used to reduce the content. When ferrous sulfate is applied, it should be mixed with organic fertilizers. If symptoms of iron deficiency have already occurred, spray the tomatoes with a solution of 0.5%-0.1% ferrous sulfate in water, or spray 2-3 times a week with lemon iron 100 mg/kg solution, and spray with organic chelate iron. Such as: a lot of dragon light iron, quicker and more effective, and high utilization rate.
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