For theistic Gloranthans, there's no "just" when it comes to agricultural work - it's a profoundly important ritual revealed by a god fulfilling the role of culture hero. Culture heroes are the inventors of the arts of life, both for the individual and the community (house building, weapon making, farming, etc.)
Because no god ever revealed a profane act, everything the gods did (and everything myths have to tell of their creative activity) are in the realm of sacred. Worshipers of Barntar experience, participate in and are energized by his divine acts through "plowing and planting and reaping", which reenact Barntar's actions and are a commemoration of the original mythic moment.
I recommend at least glancing at Eliade's "The Sacred and the Profane", it's a good and helpful read:
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