The iron-sensitive crops include soybeans, sorghum, beets, spinach, tomatoes, and apples. In general, iron deficiency is rarely seen in camphoraceae and other crops, and iron deficiency in fruit trees is more common.

The most commonly used iron fertilizer in production is ferrous sulfate, which is currently applied mostly by the top dressing method.

Spraying concentration is 0.2%~1%. The fruit trees sprayed 0.75% to 1% of ferrous sulfate before sprouting 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.

The high-pressure injection method is also an effective method of applying iron to fruit trees. That is, 0.3% to 0.5% of ferrous sulfate solution is injected directly into the xylem of the trunk and transported with the liquid stream to the desired site.

In addition, according to an expert study, when the fruit trees are deficient in yellowing iron, the iron fertilizers are sprayed alone, the diseased leaves are only spotted and green, and the new leaves are still yellow and the effect is 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.

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