In Florida, what is a common sign of nutrient imbalance that can be corrected with soil amendments?

• A. Interveinal chlorosis from iron deficiency or pH imbalance; adjust pH or apply iron chelate as appropriate.
• B. Yellowing of older leaves due to nitrogen deficiency; apply quick-release nitrogen fertilizer.
• C. Brown spots on leaves due to potassium toxicity; cease fertilizer.
• D. Uniform leaf yellowing due to waterlogging; reduce irrigation.

Answer: (A)

In Florida, a common sign of nutrient imbalance is interveinal chlorosis—yellowing between the veins on new growth—caused by iron deficiency when the soil pH is too high for iron to be available to plants. Florida soils are often sandy and naturally alkaline, so iron becomes locked up and plants show this yellowing despite having some iron in the soil. The way to fix it is to correct the pH or provide iron in a form the plant can take up easily. Lowering soil pH with acidifying amendments like elemental sulfur or similar products helps iron become available again. If the pH is managed but iron is still needed, applying chelated iron can quickly supply the nutrient and restore green color. Also, ensure good drainage and avoid over-liming, since excessive lime can raise pH further and worsen the issue.

Other options describe problems driven by different causes: nitrogen deficiency tends to turn older leaves yellow first, not new growth; potassium toxicity shows as distinct brown leaf spots and stems and usually involves altering fertilizer inputs; waterlogging affects root health and leads to general stress rather than a specific nutrient imbalance corrected by soil amendments.