Answer: Ixora grown in alkaline soil is very prone to iron and manganese deficiencies. The symptoms appear on the new foliage as leaves turn yellow or begin yellowing between the leaf veins while the veins remain green. As symptoms continue, leaves may become smaller and the buds may die. Although chelated iron and manganese can be applied to the soil as granular fertilizer, high soil pH prevents most of it from being taken up by the plant. Liquid micronutrients sprayed on the foliage work best for treating the problem. Apply these materials according to the manufacturers' recommendations (mixing with distilled water or rainwater). Protect white surfaces, such as concrete, as the fertilizer will stain them yellow. Adding organic mulches, applying soil sulfur at recommended rates, and using acidic fertilizers are all ways to help lower high pH.
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