How to apply iron fertilizer to fruit trees
The iron-sensitive crops include soybeans, sorghum, beets, spinach, tomatoes, and apples. Iron deficiency in fruit trees is more common. The most commonly used iron fertilizer is ferrous sulfate, which is currently applied mostly by the top dressing method. The specific method is as follows:
The sprayed fruit trees sprayed 0.75% to 1% of ferrous sulfate before germination or sprayed 0.5% ferrous sulfate plus 0.5% urea three times after seeing yellow leaves. It is also possible to mix ferrous sulfate and organic fertilizer in a ratio of 1:10 to 20 and apply it to fruit trees to make 70% of iron deficiency diseases regreen.
High-pressure injection means that 0.3% to 0.5% of ferrous sulfate solution is directly injected into the xylem of the trunk, and then transported with the liquid stream to the desired site.
In addition, when the fruit trees were deficient in yellowing iron, they were sprayed with iron fertilizer alone. The diseased leaves were only spotted and green, and the new leaves were still yellow and the results were poor. If urea and citric acid are added to the iron fertilizer solution, good results will be obtained. The solution is prepared by adding 25 g of citric acid to 50 kg of water and adding 125 g of ferrous sulfate after dissolution. After the ferrous sulfate is dissolved, 50 g of urea is added, ie, 0.25% ferrous sulfate and 0.05% lemon are added. Acid compound iron fertilizer with 0.1% urea.
Application Notes Iron fertilizers are mostly foliar-applied, with less base application. Generally, iron is applied when the soil available iron is less than 10 mg/kg, and has an effect of varying degrees of production increase. When it is greater than 10 mg/kg, iron application is basically ineffective. The more sensitive crops to iron are broad beans, corn and fruit trees.
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