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Foliar application generally has a concentration of ferrous sulfate of 0.2% to 0.5%, and is sprayed once every 10 days until the leaves turn green. The ferrous sulfate solution should be prepared at the time of spraying and cannot be stored. The prepared ferrous sulfate solution should be light green with no precipitation. If the water of the ferrous sulfate solution is alkaline or the calcium content is high, it is easy to form a precipitate. At the time of preparation, 10 ml of organic acid or 100-200 ml of vinegar should be added to each 100 kg of water to make the water acidified, and then ferrous sulfate is added to prepare a solution. The method of burying and fertilizing the trunk is only applicable to perennial woody plants. When applying, use a wooden drill with a diameter of about 1 cm in the middle of the trunk, and drill a hole of 1-3 cm deep under the slope, place 1-2 g of solid ferrous sulfate into the hole, and immediately use the sludge or plasticine or yellow mud to make the hole. The mouth is sealed and coated with a layer of paraffin to prevent rain from infiltrating, insects spawning and germs. Only one fertilization hole is required for each tree. Tree species that are easy to flow gum after injury, such as peach trees, pines and cypresses, should not be used. Root fertilization is used to ditch or dig a hole near the root of the crop, and is poured into the ditch or hole with 2% ferrous sulfate solution. The depth of the annual crop is 10 cm, 0.5-1 kg of ferrous sulfate solution per ditch or hole; the depth of the perennial crop is 20-25 cm, and the ferrous sulfate solution per well or hole is 5-7 kg.
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