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How to remedy the yellowing of new leaves of Citron
The yellowing of leaves in Toona sinensis after transplanting is a common issue that can be effectively managed through proper care and fertilization. One key approach is to enhance the soil's physical and chemical properties by applying organic fertilizer. When transplanting, it’s important to use decomposed manure or compost as a base fertilizer. The seedlings should be carefully transplanted with their root ball intact, and large planting holes should be dug to ensure good soil aeration and drainage. A loose, fertile, and well-draining soil environment helps prevent and reduce the occurrence of iron deficiency, which often leads to leaf yellowing.
Another effective method involves foliar spraying during the growing season. A solution of ferrous sulfate can be applied directly to the leaves. Typically, 100 to 150 grams of ferrous sulfate and 50 to 100 grams of citric acid are mixed into 50 kg of water. This mixture should be sprayed on the upper parts of the leaves during sunny days for best results. It’s essential to spray both the upper and lower surfaces of the leaves to maximize absorption. Alternatively, a solution of ferrous sulfate can also be poured directly onto the roots. For this, 100 to 150 grams of ferrous sulfate and 50 to 100 grams of citric acid are dissolved in 5 kg of water, then poured around the root area. While this method may take longer to show results, it provides long-term benefits when used consistently.
When applying ferrous sulfate, it’s recommended to combine it with a decomposed organic fertilizer solution. Organic matter in the fertilizer has a chelating effect on iron, improving its solubility and availability to the plant. Additionally, elements like calcium, magnesium, manganese, and copper can interfere with iron uptake, reducing its effectiveness. Therefore, it’s beneficial to apply fertilizers containing these elements alongside ferrous sulfate to maintain a balanced nutrient profile in the soil. By following these practices, gardeners can significantly improve the health and vitality of Toona sinensis plants after transplantation.