Iron deficiency symptoms of fruit trees often occur, and fruit trees are more prone to iron deficiency.
I. Symptoms of iron deficiency: The typical manifestation of iron deficiency in fruit trees is that the top or branch leaves are chlorotic and yellow, the veins are kept green, and brown and necrotic plaques often appear at the edge of the leaves. In the cultivation of the facility, we found that the symptoms of the anterior fruit trees in the greenhouse were more obvious than those in the back; the soil was improved and the well-drained greenhouse had obvious symptoms of iron deficiency.
Second, the cause of iron deficiency in the fruit trees: iron deficiency is a widespread problem of calcareous soil. The main causes of iron deficiency are: 1. Iron fertilizer is easily fixed in neutral and alkaline soils, solubility is reduced, and it is transformed into an intractable state, resulting in iron deficiency. 2. The calcium concentration in the soil solution is too high, which hinders the absorption of iron by the fruit trees and the effective use of iron. 3. In the production of fruit trees, due to poor air permeability, high carbon dioxide content in air and soil, bicarbonate ions are produced in calcium-containing soil, which increases the concentration of calcium and phosphorus in soil solution and reduces the effectiveness of iron in soil. Sex. 4. A large amount of nitrate nitrogen fertilizer is applied in the production of fruit trees, so that iron is oxidized and deposited around the roots of the tree. Inhalation of nitrate in the fruit trees can also promote iron oxidation and reduce activity. 5. Lack of potassium causes iron deficiency. 6, manganese and iron have antagonistic effects, causing iron deficiency. A large amount of long-term use of copper preparation pesticides and the like causes copper deposition and causes iron deficiency.
Third, prevention and treatment measures:
1. Add organic fertilizer. Organic decomposition products have a synergistic effect on iron, which increases the solubility of iron. For orchards with severe iron deficiency, iron fertilizer can be mixed with organic fertilizer to reduce soil fixation to iron.
2. Appropriately reduce the application of phosphate fertilizer and nitrate nitrogen fertilizer, and increase the application of potassium fertilizer to promote the absorption of iron fertilizer.
3. Once the symptoms of iron deficiency are manifested, the symptoms of foliar application of iron fertilizer can be relieved in time, and the yellowing leaves can turn green after 5-6 days of spraying. Foliar spray should be avoided to avoid mixing with alkaline pesticides.
4. After the fruit is harvested, the ferrous sulfate is applied to the soil in the ring root, and the cure rate for the seriously ill tree is 70%-90%.
5. When the fruit trees are built, try to avoid choosing soils with high calcium content.
I. Symptoms of iron deficiency: The typical manifestation of iron deficiency in fruit trees is that the top or branch leaves are chlorotic and yellow, the veins are kept green, and brown and necrotic plaques often appear at the edge of the leaves. In the cultivation of the facility, we found that the symptoms of the anterior fruit trees in the greenhouse were more obvious than those in the back; the soil was improved and the well-drained greenhouse had obvious symptoms of iron deficiency.
Second, the cause of iron deficiency in the fruit trees: iron deficiency is a widespread problem of calcareous soil. The main causes of iron deficiency are: 1. Iron fertilizer is easily fixed in neutral and alkaline soils, solubility is reduced, and it is transformed into an intractable state, resulting in iron deficiency. 2. The calcium concentration in the soil solution is too high, which hinders the absorption of iron by the fruit trees and the effective use of iron. 3. In the production of fruit trees, due to poor air permeability, high carbon dioxide content in air and soil, bicarbonate ions are produced in calcium-containing soil, which increases the concentration of calcium and phosphorus in soil solution and reduces the effectiveness of iron in soil. Sex. 4. A large amount of nitrate nitrogen fertilizer is applied in the production of fruit trees, so that iron is oxidized and deposited around the roots of the tree. Inhalation of nitrate in the fruit trees can also promote iron oxidation and reduce activity. 5. Lack of potassium causes iron deficiency. 6, manganese and iron have antagonistic effects, causing iron deficiency. A large amount of long-term use of copper preparation pesticides and the like causes copper deposition and causes iron deficiency.
Third, prevention and treatment measures:
1. Add organic fertilizer. Organic decomposition products have a synergistic effect on iron, which increases the solubility of iron. For orchards with severe iron deficiency, iron fertilizer can be mixed with organic fertilizer to reduce soil fixation to iron.
2. Appropriately reduce the application of phosphate fertilizer and nitrate nitrogen fertilizer, and increase the application of potassium fertilizer to promote the absorption of iron fertilizer.
3. Once the symptoms of iron deficiency are manifested, the symptoms of foliar application of iron fertilizer can be relieved in time, and the yellowing leaves can turn green after 5-6 days of spraying. Foliar spray should be avoided to avoid mixing with alkaline pesticides.
4. After the fruit is harvested, the ferrous sulfate is applied to the soil in the ring root, and the cure rate for the seriously ill tree is 70%-90%.
5. When the fruit trees are built, try to avoid choosing soils with high calcium content.
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