First, the symptoms. Iron deficiency in fruit trees mainly damages the leaves of fruit trees, especially the tip of new shoots. The initial leaf color turns yellow, and the veins remain green, making the leaves green and reticular. The symptoms are particularly evident in vigorous growing season; when severe, the leaves are completely chlorotic It turns yellow and the top of the new shoots die, affecting the normal development of the fruit tree, resulting in weakened tree vigor and being susceptible to freezing damage and other diseases. Second, the reason. In general, soils with heavy clay, poor drainage, orally alkaline soil, and iron ore with excessive application of N fertilizer are heavy. Due to poor drainage, N fertilizer is excessive and soluble divalent iron becomes trivalent iron, which is not easily absorbed by planting trees. Iron is involved in the synthesis of chlorophyll in planting trees and it is also a component of respiratory enzymes. Therefore, iron deficiency affects photosynthesis. Third, prevention and control. The current application of tree crowns for spraying iron fertilizers, trunk injections, or combined application of organic fertilizers into the soil has a certain control effect, but the effect is not ideal, or the effect is slow, or difficult to operate. Therefore, we have tested and summarized methods for rapidly correcting iron deficiency in fruit trees. 1. Use pharmaceuticals: 90% of ferrous sulfate 150 times. 2. Application method: In the place where the root of the diseased part of the fruit tree is 1.5 meters away from the main trunk, dig a pit with a width and depth of 0.4 meters, 0.3 meters and 0.2 meters, and 30 kg of water for each pit. The grape is 0.5 meters deep around the main trunk and 0.3 meters deep and 0.3 meters wide. Dig the same ring groove 0.5 meters away from the groove. Generally, the grapes will use 0.1 kilogram per plant. . At the same time, tests on trees such as apples, pears, and peaches have also received good results. After 3 days after spraying, the yellow leaves started to turn green and all turned green on the 5th day. 3, cost accounting: ferrous sulfate price is only 0.6 yuan / kg, 1 kg per plant, the cost is particularly low, in addition to this method of rapid treatment, the effect is good. 4. Notes: (1) Test according to tree vigor to avoid burning root. (2) Strictly control the amount of medication, and each tree should not exceed 1 kilogram. Do not exceed 0.25 kg of ferrous sulfate per pit. (3) The amount of water should be more than 30 kg per pit.
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