What fertilizers effectively treat zinc deficiency?

Effective zinc fertilizers can quickly support deficiency through specific formulations that match soil conditions. Zinc sulfate is effective in acidic soils, and chelated zinc is most effective in alkaline conditions. Synthetic fertilizers are quicker acting, whereas organic amendments help build long-term soil health. Your choice will depend on the pH range and the rate at which you want to correct the deficiency.

If soil pH is below 6.5, zinc sulfate (ZnSO₄) can be used at 5-10 kg/ha (4-9 lb/acre). Broadcast and incorporate it 6 inches (15 cm) deep before planting. Zinc sulfate is a relatively inexpensive choice, as it immediately addresses zinc deficiency with residual effects in the soil for 2-3 seasons. Avoid contact with the foliage to prevent leaf burn.

Using a combination of methods will yield the best results. Mildly acidic soils should use zinc sulfate and organic compost. In alkaline soils, use chelated zinc, supplemented with extra microbial inoculants, and apply timing applications in relation to when synthetic fertilizers are applied at planting. Additionally, incorporate organic amendments in the fall. Soil testing every two years is the recommendation to modify any programs.

When selecting a fertilizer, consider the specific needs of the crop. Corn uses continued higher zinc rates than soybeans. Citrus needs constant low rates of chelates through irrigation. Always wear protective equipment when using concentrated zinc, and store fertilizers in moisture-free, airtight containers.

Monitor results with leaf tissue tests 4-6 weeks after application. Look for zinc levels of 20-100 ppm in new growth. Use plant response and soil tests to inform future applications. Selecting the correct fertilizer will prevent zinc toxicity and allow for vigorous growth in the crops.

Read the full article: Zinc Deficiency Plants: Symptoms and Solutions