This poem, Mi Li, should have been written by a wandering poet. Described a large area of Gu Zidi, rows of neatly arranged millet, a mature millet scene. The end of each paragraph expresses the poet's melancholy mood of worrying about the country and the people, which makes people feel sad after reading it.
This poem cannot be called mourning. It can be called sentimental poem or melancholy poem.
There are many such poems expressing sadness in The Book of Songs.