Carrots show dry curled leaves. Sweet potatoes form a long and thin tuber. Peas show dwarfed plants and seeds with a thick coat. Soybeans are wrinkled and misshapen. Potassium deficiency generally shows that the growing portions of plant are failing to grow.
Potassium is found in highest concentrations in plant leaves, rather than seeds.
Blotchy ripening - portions of the tomato remain green and do not show a full green color. Black leaf- interveinal leaf exposed to the sun turns lblack. Usually caused by potassium deficiency. Scorching - can be from magnesium deficiency, excessive soluble salts, droubt or born toxicity. Potash is the most commonly available form of potassium.