What season is the ancient poem of hoeing and sweating in the afternoon?

Li Shen, a native of Bozhou, Anhui Province, has been an official in Chang 'an for a long time, so his poems should be about farmers in the Huang-Huai-Hai area, basically planting wheat in late autumn and sowing autumn grain after harvesting wheat in midsummer.

It is winter when the wheat planted in late autumn grows into seedlings. It's hard to sweat when weeding. The only thing that makes people sweat is the crops sown in summer and harvested in autumn, and the seedling stage of these crops can only be in summer.