In a manner relating to or characteristic of agriculture; from the perspective of farming or crop production.
From agricultural plus the adverbial suffix -ly. Traces back to agriculture (Latin agr- plus cultura) with added -ly to make it describe how something is done.
Agriculturally is how scientists and policymakers write when they're making arguments about farming—you might read 'agriculturally significant land' or 'agriculturally sustainable practices,' showing how this adverb marks formal discussion of farming policy.
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