Symptoms of Potassium Deficiency. Reduced Growth. If you see one plant or group of plants in your garden that are smaller than the others, then a potassium deficiency may be to blame. Yellowing of Old Leaves. Weak Roots. Small Stems. Defoliation. Visual Symptoms: Check the leaves for symptoms of potassium deficiency, such as yellowing, leaf curling, and necrosis. Timing: Potassium deficiency typically occurs later in the season when the plant's demand for potassium is highest. Fixing Potassium Deficiency Identifying Potassium Deficiency In Plants Potassium deficiency results in very stunted plant growth and yellow or purple tinted leaves. Older, lower leaves look wilted with browning and curling at leaf edges and yellowing between leaf veins and around leaf edges. Potassium Deficiency in Plants. The other mobile macronutrient, Potassium, is important for the transportation and synthesis of simple carbohydrates and sugars. It is needed for plants to absorb and transport water, improve cell division and root growth. Additionally, Potassium is needed for Adenosine Triphosphate (ATP) production, a cellular .

potassium deficiency symptoms in plants