What's funny about that is that I've got people close to me in the farming industry and let me tell you, I would put my faith in them before anyone from the city to be self sufficient.

Not all farms are mega farms and even the people working on mega farms have more than enough knowledge to grow food without all the tech they currently use. The reason they need it is to... Feed cities! If you only have hundreds of even thousands to feed you don't need fields that's are tens of thousands of acres.

Hell, look at poor countries, there's tons of self sufficient communities out there, none of them are urban. Why? Because food doesn't grow on concrete.