Answer:
"Spring and all" relates to the conventions of pastoral poetry because:
The poem describes nature in a certain scenario but it complements it by idealizing it with a value judgment.
Step-by-step explanation:
The two reasons that back the answer are that in the first place description is good and objective. However, when it is complemented with believes, and opinions, they gain a grade of value judgment. In our case the association between pastoral poetry and the poem of William is that he idealizes certain aspects of the scenario he describes like:
But now the stark dignity of
entrance—Still, the profound change
has come upon them: rooted, they
grip down and begin to awaken
Providing dignity to a natural characteristic that is improper of it. Showing his idealizations.