One of the most important developments in our history as a sentient species was the development of agriculture. When our ancestors decided to grow their food instead of gathering it, it allowed us to put down roots, build cities, create technology and forge modern civilization. But something that helped humanity was being generalist omnivores. What if another species doesn’t have that option?
Now while it is argued that meat eating is something to expect from sentient aliens, there is some proof that intelligence can arise within plant eating animals. The elephant is one of the creatures on planet earth that is self aware and can recognize themselves in the mirror and all they eat is grass. Not to mention manipulator appendages like giraffes tongue or the elephants trunk would be helpful in tool use.
But how would a civilization of plant eaters handle food production for their civilization. Would herbivores need to use the same slash and burn techniques humans used on earth? Would they domesticate animals as beasts of burden? So many possibilities that need to be addressed. Which brings me to my question:
What would agriculture look like for a species of sentient herbivores?
Edit: for the level of society, I was thinking some type of preindustrial civilization, so they have figured out how to feed cities of themselves. As for how rich their food is allowed to be, I would assume they would try to go for the most bang per buck.