The poem describing children's efforts to help adults do farm work is

Forty Kinds of Pastoral Miscellanies (Part 3 1)

Tilling during the day, numb at night,

The children in the village are responsible for their own affairs.

Children and grandchildren have not been liberated to engage in farming and textile,

And learn to grow melons in the shade of mulberry trees.

Weeding in the fields during the day and rubbing hemp thread at night.

Farmers' children are busy and have their own specialties.

Those children can neither follow nor knit.

Instead, plant melons under the lush mulberry trees, imitating the appearance of adults.