摘要: With all this activity, potassium has not been shown to be a part of the plant's organic structure. Instead, it acts as a policeman in the plant, keeping traffic ways operating efficiently. More specifically, washing dried plant leaves will remove most of the potassium, while leaving essentially all of the nitrogen and phosphorus behind in the leaf's structure.Plant leaves, when functioning properly, will contain about 2 percent or more potassium. Thus, when hay and silage are removed from a field, large amounts of potassium are also removed. However, when stover and straw are left in the field after grain harvest, much of the potassium in the plant is returned to the soil.