《农桑辑要·耕垦·耕地》
立春的物候是：地气开始通达，土块散开，土中的陈根可用手拔出。
春候地气始通，土块散，陈根可拔。
The phenology of the beginning of spring is: the earth's energy begins to flow, the soil blocks are scattered, and the old roots in the soil can be pulled out by hand.