Symptoms of iron deficiency in fruit trees often occur, and fruit trees are more susceptible to iron deficiency.
First, iron deficiency symptoms: The typical manifestation of iron deficiency in fruit trees is the chlorosis of the apical or branch shoots, but the veins remain green, and velvety necrotic plaques often appear at the edges of the leaves. In severe cases, deciduous shoots occur. In the facility cultivation, we found that the symptoms of fruit trees in the front part of the greenhouse were more pronounced than those in the rear part; the symptoms of iron deficiency in well-drained greenhouses with soil were improved.
Second, the reasons for the lack of iron in facilities fruit trees: Iron deficiency is a widespread problem in calcareous soil. The main causes of iron deficiency are: 1. Iron fertilizers are easily fixed in neutral and alkaline soils, and their solubility is reduced, and they become difficult to use, resulting in iron deficiency. 2. The calcium concentration in the soil solution is too high, which hinders the absorption of iron by fruit trees and the effective use of iron. 3. In the production of fruit trees in the facility, because of poor ventilation, high carbon dioxide content in air and soil, bicarbonate ions are produced in calcium-containing soils, which increases the concentration of calcium and phosphorus in the soil solution and reduces the effectiveness of iron in the soil. Sex. 4. A large amount of nitrate-N fertilizer is applied in the production of fruit trees in the facility, so that iron is oxidized and deposited around the roots of trees. Inhalation of nitrate in fruit trees can also promote iron oxidation and reduce activity. 5, lack of potassium caused by iron deficiency. 6, manganese and iron antagonism, causing iron deficiency. A large number of long-term use of copper preparations and pesticides cause copper deposition and cause iron deficiency.
Third, prevention and control measures:
1, increase organic fertilizer. Decomposition of organic matter complexes iron and increases the solubility of iron. For orchards with severe iron deficiency, iron fertilizers can be mixed with organic fertilizers to reduce soil iron fixation.
2. Appropriately reduce the application of phosphate fertilizers and nitrate nitrogen fertilizers and increase potash fertilizers to promote iron fertilizer absorption.
3. Once iron deficiency symptoms are manifested, promptly apply foliar spray of available iron fertilizer to relieve symptoms. After 5-6 days of spraying, the yellowing leaves can turn green. Foliage spraying to avoid mixing with alkaline pesticides.
4, can be in the fruit after picking, in the soil to take a ferrous sulfate ring, the cure rate of severe disease trees reached 70% -90%.
5. As far as possible, the facility should avoid selecting the soil with high calcium content when setting up the garden.
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