In flowering and planting, iron deficiency can cause yellowing of leaves. The symptoms of iron deficiency first appear yellow from the veins of the new leaves, the veins are still green, and then the whole leaf color turns yellow or white. In the case of iron deficiency in large flowers and trees, the leaves of the lighter plants turn yellow and the growth is slow; in severe cases, the canopy is dry and the entire plant is withered. If timely rescue with iron fertilizer, can receive significant results.
Usually, when plants and plants suffer from iron deficiency chlorotic chlorosis, most of them use ferrous sulfate (green glycosides), but it is unstable in nature and easily oxidizes to lose water and turns into brown iron sulfate, especially at high temperature or strong light. In the presence of alkaline substances, ferrous sulfate is less stable. The water used to dissolve ferrous sulfate loses its effectiveness if the pH is greater than 6.5. Or when ferrous sulfate is not properly preserved, it changes from blue-green to brown, indicating that it has been oxidized to ferric sulfate. Even if it is applied, it cannot be absorbed and utilized by flowers and plants. Self-administered iron fertilizer can overcome the above phenomenon and can be planted after being applied. Absorption in time, remedy chlorotic yellowing significantly. Two kinds of iron fertilizer preparation methods are introduced below:
1, the indigenous iron fertilizer. When preparing, one part of crushed ferrous sulphate and 5 parts of decomposed or semi-ripe organic fertilizer are evenly mixed to make up the composite iron fertilizer for soil. If the organic fertilizer has low water content, it needs to be moistened with water to make the water content. About 50%. In the preparation, ferrous sulfate is evenly sprinkled on the organic fertilizer, and the mixture is uniformly mixed while stirring. When used, first dig an annular groove along the crown, with a groove width of about 50 cm. The well-mixed organic fertilizer is uniformly applied into the ditch, and water is applied after the soil is covered. Large-scale plants and trees fertilize 4 to 5 kilograms per plant, and small plants use 3 to 4 kilograms per plant. The fertilization time is suitable before flower buds sprout. It can also be carried out in combination with basal fertilisers in autumn. Avoid application during the growth period to avoid fertilizer damage. Apply more than 95% by this method.
2. When iron fertilizer is applied on leaves, choose 0.25% ferrous sulfate, 0.05% citric acid, and 0.1% urea for use. First add 50 grams of citric acid to 100 kilograms of water. Add 250 grams of ferrous sulphate after dissolution. Stir until the ferrous sulphate dissolves and then add 100 grams of urea. Apply the compound iron fertilizer to the foliage. The addition of citric acid can prevent the hydrolysis of ferrous sulfate, ensure that iron is in an effective state, and can be fully absorbed and utilized by plants. The addition of urea can promote the synthesis of chlorophyll, which is beneficial to the re-greening of diseased plants and flowers. This self-made foliar spray of iron fertilizer should be used during the growth period of flowers and plants. It should be sprayed before 11 a.m. and after 3 p.m. Each tree was sprayed with about 15 kilograms of each tree. The small trees sprayed about 10 kilograms per plant and sprayed again after 10 days. Generally, after two sprayings, the chlorotic leaves became green.
Note: When applying to soil, it is not appropriate to apply ammonium nitrogen fertilizer together with elements that have antagonistic effects with iron. Ammonium sulphate such as ammonium sulfate, ammonium hydrogencarbonate and ammonium phosphate can destroy organic iron complexes in water and soil, and oxidize divalent iron to trivalent iron that is not easily absorbed. Calcium, magnesium, manganese, copper and other elements have an antagonistic effect on iron and can reduce the effectiveness of iron. When using homemade iron fertilizers, it is best to apply fertilizers containing these elements at the same time, while applying decomposed organic fertilizers at the same time. The effect is better, due to decomposition products of organic matter, it has complexation effect on iron. Can improve the solubility and effectiveness of iron.
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