Is the well water in the vegetable greenhouse polluted?

Well is of great significance to the development of human civilization. Before the emergence of wells, human beings lived by water and could only live in places with surface water or springs. The invention of water wells expanded the scope of human activities. China is one of the earliest countries in the world to develop and utilize groundwater. The earliest well discovered in China is the well of Hemudu ancient cultural site in Yuyao, Zhejiang, about 5700 years ago. This is a very delicate square wooden well with a depth of 1.35 m and a side length of 2 m. It can be inferred that the original well appeared much earlier. The United States imports Puweixin Tmall