How Can the Grassroots Not Have Common Sense?

The villagers joked that Amu spent a lot of money to buy a piece of saline-alkali land that no one wanted, saying that farmers knew that nothing could grow on that land. Amu didn't argue and dug in the ground silently for three months. In the fourth month, he built the village's first fish pond - the saline-alkali water is perfect for raising saltwater fish.