Heck, you don't really need tractors, these can be substituted with manpower. They're a nice to have more than a must. What you will need, however, is someone

Heck, you don't really need tractors, these can be substituted with manpower. They're a nice to have more than a must. What you will need, however, is someone to maintain waterways and water treatment facilities, and the necessary components. Can't count on rainfall being sufficient or wells being clean. This comes with maintaining the power supply and electronic components thereof.