Potassium regulates water movement within the plant, activates enzymes, and strengthens cell walls. It's the nutrient most associated with disease resistance, drought tolerance, and the quality (size, colour, shelf-life) of fruit and grain.
Validated against standard laboratory soil test values by Kerala Agricultural University, College of Agriculture, Vellayani.
Older leaves develop yellowing and browning along the edges and tips first, often described as 'scorched' margins.
Without potassium's structural support, cereal crops are prone to falling over (lodging) before harvest.
Potassium-deficient plants are markedly more susceptible to fungal and bacterial infections.
Fruits ripen unevenly, develop smaller size, and have shorter shelf life without adequate potassium.
Illustrative comparison — actual symptom severity varies by crop species, growth stage, and the presence of compounding deficiencies.