In Germany, the impact produced in the soil from the amount of worm waste per square meter per year was one to two times greater than that of the amount of fertilizer ordinarily used on farmland.
蚯蚓糞便如良肥，德國由一平方公尺收集到蚯蚓一年的糞便量，發現它在土壤中產生的作用，等於一般農地施用肥料的一到兩倍。