how does the poem indirectly instruct us to work for afforestation?
In the poem, “The Poplar Field”, the poet indirectly suggests that destroying the forest means destroying the source of human life and pleasures.
You can find the summary of the poem from here:
But to further answer your question:
It is in defense of the conservation of nature and so linking indirectly to also work for afforestation. He also linked the deforestation as being the end of human life and pleasures.
Trees are very necessary for human beings. They are important natural resources. They shouldn’t be misused. The poet also says that though we can plant trees, they don’t grow as fast as the trees are being cut down in the present time. So, he says that he can’t see such a jungle being replanted and grown-up before his death.