I did farming as part of my student teaching... we:
*researched farms in the different countries they studied throughout the year
*made soil Sam (homemade chia pet)
*taked about adjectives by describing farm animals or equipment
*read lots fo farm books
*did farm-related math problems
The kids really got in to it... 2nd grade is fun because they're able to work more independently in groups... let me know if you want more info on any of these.