Zinc activates dozens of enzymes involved in growth hormone production, particularly auxins that control cell elongation. It's one of the most common micronutrient deficiencies worldwide, especially in high-pH and sandy soils.
Validated against standard laboratory soil test values by Kerala Agricultural University, College of Agriculture, Vellayani.
Without zinc-driven auxin production, stem segments fail to elongate, giving plants a clustered, rosette-like appearance.
New leaves emerge progressively smaller and narrower — a condition sometimes called 'little leaf'.
Older leaves can develop a bronze or grey discolouration between veins, especially in cereals and citrus.
Zinc deficiency during reproductive stages directly reduces grain number and fill in cereal crops.
Illustrative comparison — actual symptom severity varies by crop species, growth stage, and the presence of compounding deficiencies.