What I see here is a machine that replaces human work with petrol. We could definitely feed people without these machines, but there might be less meat in their plate, and more workers needed to produce the food.
It would just shift more to healthier meat like beef instead of so much chicken. Beef production requires no large tractors, seeders, harvesters, etc. You are just letting cows eat grass. Chicken production is basically an extra step in corn production, so it needs all the equipment involved in corn production.
