What season is it to plant a millet in spring and harvest 10 thousand seeds in autumn?

This poem, written in autumn, vividly depicts the fruitful scenes everywhere, highlighting the realistic problem that farmers have worked hard to get a bumper harvest, but starved to death with empty hands.

In spring, as long as you sow a seed, you can harvest a lot of food in autumn. There is no waste of heaven and earth, and the toiling peasants are still starving to death. -Li Shen's "Compassion for Farmers"