What are the symptoms of potassium deficiency in plants?

Potassium deficiency in plants is characterized primarily by the symptoms of edge burn or scorching, particularly observed on older leaves. This is due to potassium’s crucial role in maintaining turgor pressure, regulating stomatal opening, and contributing to photosynthesis and nutrient transport within the plant. As potassium levels become insufficient, the plant struggles to manage water and nutrient balance, leading to symptoms such as marginal necrosis or scorching along the edges, especially in mature leaves.

The other choices represent symptoms that may be associated with different nutrient deficiencies or plant stressors. For instance, yellowing of leaf veins is commonly linked to magnesium deficiency. Stunted growth overall can be indicative of several deficiencies or stress factors, including insufficient nitrogen or poor environmental conditions. Dark green leaves with poor flowering are often a sign of excess nitrogen rather than potassium deficiency. Understanding these distinct symptoms helps in accurately diagnosing nutrient issues, which is critical for effective crop management.