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Leaf iron fertilizer 1 preparation. 0.25% ferrous sulfate, 0.05% citric acid, and 0.1% urea were selected for use. First, add 50 grams of citric acid in 100 kilograms of water, dissolve it, add 250 grams of ferrous sulfate and stir well. After the ferrous sulfate is dissolved, add 100 grams of urea to form a composite iron fertilizer for foliar surface. The addition of citric acid can liquefy the solution, prevent the hydrolysis of ferrous sulfate, ensure that the iron is in an effective state, and can be fully absorbed and utilized by the plant; the addition of urea can promote the synthesis of chlorophyll, which is beneficial to the greening of the diseased tree. 2 usage and dosage. The fertilizer should be used during the growing season of fruit trees, and it is advisable to spray before 11:00 am and after 3 pm. The big tree is sprayed 15 kg per plant, the small tree is sprayed about 10 kg per plant, and the second spraying is carried out 10 days later. After two sprayings, it not only makes the leaves green, but also helps to increase the weight of the single fruit.
Earth iron fertilizer 1 preparation. Mix 1 part of crushed ferrous sulfate with 5 parts of decomposed or semi-fermented organic fertilizer to form a composite iron fertilizer for soil. If the organic fertilizer contains less water, it needs to be wetted with water to make the water content about 50%. During the preparation, the ferrous sulfate is evenly sprinkled on the organic fertilizer, and stirred while being sprinkled to make it evenly mixed. 2 usage and dosage. When using, firstly dig the annular groove along the periphery of the crown, the width of the groove and the depth of the groove are each about 50 cm. The mixed organic fertilizer is evenly applied into the ditch, and the soil is covered with water. The big tree fertilizes 4 to 5 kg per plant, and the small tree fertilizes 3 to 4 kg per plant. The fertilization time is suitable before the germination of the fruit trees, and can also be carried out in combination with the application of the base fertilizer in the autumn, and should not be applied in the growing season to avoid the occurrence of fertilizer damage. Applying this method, the cure rate of iron deficiency in fruit trees can reach more than 95%.
When the fruit tree is deficient in iron, the leaves of the lighter turn yellow and the growth is slow; the heavy ones cause the yield and quality to decline, and even cause the crown to shoot or the whole plant to die. Here are two ways to customize iron fertilizer:
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