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Potassium is a major mineral nutrient required in tomato plant.Applying potash can increase tomato yield obviously,especially in marketable yield.The content of soluble sugar,organic acid and soluble solid also increased when potash applied,hence fruit quality improved.Potassium fertilizer can decrease plant diseases in tomato production.Plant growth is restricted when potassium deficiency; if potassium deficiency is continued,the leaves wither and die from the bottom to the top of the plant and the end result is plant death.