In the process of growth and development of tomato, it is necessary to absorb a variety of nutrients. When a certain element is lacking, it will show a corresponding lack of symptoms on the external morphology, which will affect the yield and quality of tomato. Here is a brief introduction to the symptoms and remedies of some of the major nutrient deficiency problems in tomato.
Nitrogen-deficient plants grow slowly. The old leaves are yellow-green at the beginning, and the whole plant is pale green in the later period. The leaves are small and upright. The veins change from yellow-green to dark purple. Stems hardened. Smaller fruit, remedies: Ammonium bicarbonate or urea can be mixed into 10 to 15 times the decomposed organic fertilizer applied to the plant on both sides of the cover after watering, can also be sprayed on the foliage 0.2% ammonium bicarbonate solution.
Phosphorus deficiency early purple purple leaves, brown spots appear on the leaves, leaves stiff, dark brown tip dead. The veins gradually turn purple. Stem is long and rich in fiber. The result is delayed. Prevention and Remedy: Apply phosphate fertilizer to the seedling stage and planting period, and also use 0.2% to 0.3% potassium dihydrogen phosphate solution for foliar spray.
In the early stage of potassium depletion, the tip of the leaf appeared black-brown point, and the stem also showed dark brown spots with curled leaves. Roots are stunted. Young fruit easy to fall off or more deformed fruit. Prevention and remedies: Based on the application of organic fertilizer, sufficient potassium fertilizer can be applied, and potassium sulfate can be chased on both sides of the plant, covering the soil after application. Can also be used 0.2% ~ 0.3% potassium dihydrogen phosphate solution or 1% of ash leaching liquid foliar spray.
Calcium-deficient plants were thin, wilt, and the edges of the heart were yellow and shrunken. In severe cases, the heart and leaves died, the middle leaves of the plants formed dark brown patches, and the whole plant leaves were rolled up. Very underdeveloped. The fruit is prone to umbilical rot and empty fruit. Prevention and remedial methods: The right amount of right ash can also be applied in the tomato growth period or when calcium deficiency is found in the plant. The 0.3% to 0.5% calcium chloride aqueous solution is sprayed on the leaves and sprayed once every 3 to 4 days. A total of 2 or 3 times.
Magnesium deficiency in the lower part of the old leaves chlorosis, posterior to the upper leaf expansion, the formation of yellow leaves. Severe leaf margin curls, necrotic spots appear between veins, leaves dry, and finally the whole plant turns yellow. Prevention and remedies: Apply enough organic fertilizer, increase the magnesium fertilizer, but also in the tomato growth period or found in plants when magnesium deficiency, with 1% to 3% magnesium sulfate solution foliar spray.
Sulfur deficiency is pale green and curled upwards. Plants appear light green or yellow-green. After the heart leaves dead or less result. Remedy: Increase sulfur fertilizers such as ammonium sulfate.
The most significant symptom of boron deficiency is chlorosis or orange red. The growing point is dark, and when serious, the growing point withered and died. The stems and petioles are fragile and easy to fall off the leaves. Root dysplasia turns brown. It is easy to produce deformed fruit and there are brown spots on the skin. Remedy: When boron deficiency is found in plants, spray with 0.1% to 0.2% borax aqueous solution, spray once every 5 to 7 days, and spray 2 to 3 times.
The middle leaves or old leaves of manganese deficiency were light green, and the posterior young leaves were chlorotic. A reticular pattern appeared on the leaves, and the chlorosis between veins was light yellow. Remedy: The plant was found to be deficient in manganese and can be sprayed with 1% manganese sulfate solution.
Nitrogen-deficient plants grow slowly. The old leaves are yellow-green at the beginning, and the whole plant is pale green in the later period. The leaves are small and upright. The veins change from yellow-green to dark purple. Stems hardened. Smaller fruit, remedies: Ammonium bicarbonate or urea can be mixed into 10 to 15 times the decomposed organic fertilizer applied to the plant on both sides of the cover after watering, can also be sprayed on the foliage 0.2% ammonium bicarbonate solution.
Phosphorus deficiency early purple purple leaves, brown spots appear on the leaves, leaves stiff, dark brown tip dead. The veins gradually turn purple. Stem is long and rich in fiber. The result is delayed. Prevention and Remedy: Apply phosphate fertilizer to the seedling stage and planting period, and also use 0.2% to 0.3% potassium dihydrogen phosphate solution for foliar spray.
In the early stage of potassium depletion, the tip of the leaf appeared black-brown point, and the stem also showed dark brown spots with curled leaves. Roots are stunted. Young fruit easy to fall off or more deformed fruit. Prevention and remedies: Based on the application of organic fertilizer, sufficient potassium fertilizer can be applied, and potassium sulfate can be chased on both sides of the plant, covering the soil after application. Can also be used 0.2% ~ 0.3% potassium dihydrogen phosphate solution or 1% of ash leaching liquid foliar spray.
Calcium-deficient plants were thin, wilt, and the edges of the heart were yellow and shrunken. In severe cases, the heart and leaves died, the middle leaves of the plants formed dark brown patches, and the whole plant leaves were rolled up. Very underdeveloped. The fruit is prone to umbilical rot and empty fruit. Prevention and remedial methods: The right amount of right ash can also be applied in the tomato growth period or when calcium deficiency is found in the plant. The 0.3% to 0.5% calcium chloride aqueous solution is sprayed on the leaves and sprayed once every 3 to 4 days. A total of 2 or 3 times.
Magnesium deficiency in the lower part of the old leaves chlorosis, posterior to the upper leaf expansion, the formation of yellow leaves. Severe leaf margin curls, necrotic spots appear between veins, leaves dry, and finally the whole plant turns yellow. Prevention and remedies: Apply enough organic fertilizer, increase the magnesium fertilizer, but also in the tomato growth period or found in plants when magnesium deficiency, with 1% to 3% magnesium sulfate solution foliar spray.
Sulfur deficiency is pale green and curled upwards. Plants appear light green or yellow-green. After the heart leaves dead or less result. Remedy: Increase sulfur fertilizers such as ammonium sulfate.
The most significant symptom of boron deficiency is chlorosis or orange red. The growing point is dark, and when serious, the growing point withered and died. The stems and petioles are fragile and easy to fall off the leaves. Root dysplasia turns brown. It is easy to produce deformed fruit and there are brown spots on the skin. Remedy: When boron deficiency is found in plants, spray with 0.1% to 0.2% borax aqueous solution, spray once every 5 to 7 days, and spray 2 to 3 times.
The middle leaves or old leaves of manganese deficiency were light green, and the posterior young leaves were chlorotic. A reticular pattern appeared on the leaves, and the chlorosis between veins was light yellow. Remedy: The plant was found to be deficient in manganese and can be sprayed with 1% manganese sulfate solution.
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