In the process of growth and development, tomato needs to absorb a variety of nutrients. When a certain element is lacking, it will show corresponding symptoms of deficiency in the external form, which will have certain effects on tomato yield and quality. Here is a brief introduction to the symptoms and remedies of some of the main symptoms of tomato deficiency.
Nitrogen deficiency The plant grows slowly, the early leaves are yellow-green, and the whole plant is light green in the later stage, and the leaves are small and erect. The veins change from yellow-green to deep purple. The stalks become hard. The fruit is reduced, and the remedy method can be carried out by applying ammonium bicarbonate or urea to the decomposed organic fertilizer mixed with 10-15 times of liquid, applying it to both sides of the plant, and then spraying the soil with water, or spraying 0.2% ammonium hydrogencarbonate solution on the leaf surface.
Phosphorus deficiency The early leaf back is purple-red, with brown spots on the leaves, the leaves are stiff, and the tips are dark brown. The veins gradually turn purple. The stem is slender and rich in fiber. The result is delayed. Prevention and remediation methods: Phosphate fertilizer should be applied during the seedling and planting period, and 0.2% to 0.3% potassium dihydrogen phosphate solution can also be applied by foliar application.
Potassium deficiency At the beginning of the leaf margin, the tip of the leaf has a dark brown spot, and the stem has dark brown spots and the leaves are curled. Root dysplasia. Young fruit is easy to fall off or more deformed fruit. Prevention and remediation methods: On the basis of multiple application of organic fertilizer, the potassium fertilizer can be applied to the plants, and the potassium sulfate can be applied to the sides of the plants to cover the soil. It can also be sprayed with 0.2% to 0.3% potassium dihydrogen phosphate solution or 1% grass ash leaching solution.
Calcium deficiency The plants are thin and wilting, and the edges of the heart are yellow and shrunken. When the heart leaves are dead, the leaves in the middle of the plant form dark brown spots, and the leaves of the whole plant are rolled up. Very undeveloped. Fruits are prone to umbilical rot and hollow fruit. Prevention and rehabilitation methods: Apply appropriate amount of right ash, or use 0.3% to 0.5% calcium chloride aqueous solution foliar spray in the tomato growth period or when the plant is deficient in calcium, spray once every 3 to 4 days. A total of 2 to 3 times.
Magnesium deficiency The lower old leaves are chlorotic, and the upper leaves expand to form the yellow mosaic leaves. Severe leaf margins rolled up, necrotic spots appeared between veins, leaves dried up, and finally the whole plant turned yellow. Prevention and remedy: Apply the fermented organic fertilizer and increase the application of magnesium fertilizer. It can also be sprayed with 1% to 3% magnesium sulfate solution in the tomato growth period or when the plant is found to be deficient in magnesium.
Sulfur deficiency The leaf color is light green and curls upwards, and the plants are light green or yellowish green. After the heart leaves withered or less results. Remedy: Add sulfur-containing fertilizers such as ammonium sulfate.
The most notable symptom of boron deficiency is that the leaves are chlorotic or orange-red. The growth point is dark, and in severe cases, the growth point is withered and died. The stem and petiole are fragile, which tends to cause the leaves to fall off. Root dysplasia turns brown. It is prone to deformed fruit with brown spots on the peel. Remedy: When the plant is found to be deficient in boron, spray it with 0.1% to 0.2% borax aqueous solution, spray once every 5 to 7 days, and spray 2 to 3 times.
Manganese deficiency The central or old leaves are light green, the young leaves are chlorotic, the reticular lines appear on the leaves, and the chlorosis between the veins is pale yellow. Remedy: The plant is found to be deficient in manganese and can be sprayed with 1% manganese sulfate solution.
Anxin County Plant Protection Station (071600)
Excerpted from: Hebei Science and Technology News
Nitrogen deficiency The plant grows slowly, the early leaves are yellow-green, and the whole plant is light green in the later stage, and the leaves are small and erect. The veins change from yellow-green to deep purple. The stalks become hard. The fruit is reduced, and the remedy method can be carried out by applying ammonium bicarbonate or urea to the decomposed organic fertilizer mixed with 10-15 times of liquid, applying it to both sides of the plant, and then spraying the soil with water, or spraying 0.2% ammonium hydrogencarbonate solution on the leaf surface.
Phosphorus deficiency The early leaf back is purple-red, with brown spots on the leaves, the leaves are stiff, and the tips are dark brown. The veins gradually turn purple. The stem is slender and rich in fiber. The result is delayed. Prevention and remediation methods: Phosphate fertilizer should be applied during the seedling and planting period, and 0.2% to 0.3% potassium dihydrogen phosphate solution can also be applied by foliar application.
Potassium deficiency At the beginning of the leaf margin, the tip of the leaf has a dark brown spot, and the stem has dark brown spots and the leaves are curled. Root dysplasia. Young fruit is easy to fall off or more deformed fruit. Prevention and remediation methods: On the basis of multiple application of organic fertilizer, the potassium fertilizer can be applied to the plants, and the potassium sulfate can be applied to the sides of the plants to cover the soil. It can also be sprayed with 0.2% to 0.3% potassium dihydrogen phosphate solution or 1% grass ash leaching solution.
Calcium deficiency The plants are thin and wilting, and the edges of the heart are yellow and shrunken. When the heart leaves are dead, the leaves in the middle of the plant form dark brown spots, and the leaves of the whole plant are rolled up. Very undeveloped. Fruits are prone to umbilical rot and hollow fruit. Prevention and rehabilitation methods: Apply appropriate amount of right ash, or use 0.3% to 0.5% calcium chloride aqueous solution foliar spray in the tomato growth period or when the plant is deficient in calcium, spray once every 3 to 4 days. A total of 2 to 3 times.
Magnesium deficiency The lower old leaves are chlorotic, and the upper leaves expand to form the yellow mosaic leaves. Severe leaf margins rolled up, necrotic spots appeared between veins, leaves dried up, and finally the whole plant turned yellow. Prevention and remedy: Apply the fermented organic fertilizer and increase the application of magnesium fertilizer. It can also be sprayed with 1% to 3% magnesium sulfate solution in the tomato growth period or when the plant is found to be deficient in magnesium.
Sulfur deficiency The leaf color is light green and curls upwards, and the plants are light green or yellowish green. After the heart leaves withered or less results. Remedy: Add sulfur-containing fertilizers such as ammonium sulfate.
The most notable symptom of boron deficiency is that the leaves are chlorotic or orange-red. The growth point is dark, and in severe cases, the growth point is withered and died. The stem and petiole are fragile, which tends to cause the leaves to fall off. Root dysplasia turns brown. It is prone to deformed fruit with brown spots on the peel. Remedy: When the plant is found to be deficient in boron, spray it with 0.1% to 0.2% borax aqueous solution, spray once every 5 to 7 days, and spray 2 to 3 times.
Manganese deficiency The central or old leaves are light green, the young leaves are chlorotic, the reticular lines appear on the leaves, and the chlorosis between the veins is pale yellow. Remedy: The plant is found to be deficient in manganese and can be sprayed with 1% manganese sulfate solution.
Anxin County Plant Protection Station (071600)
Excerpted from: Hebei Science and Technology News
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