种菜的旧土得过病害怎么处理？简单3步处理一下，比新的土还好用
How to deal with the disease of the old soil of vegetable planting? It is easier to handle it in 3 steps than the new soil
旧土处理方式（2）：   • 如何把旧土变成有机肥土？手把手教你2个简单、安全的土壤消毒方法，杀死土壤中...