[imtringued]

You need the tractor and fuel for farming or else you are going to waste your entire life farming and not getting anywhere. You need the car to transport and trade with others. Honestly, a lot of Africans won't notice anything different in a technology apocalypse.

[cheese_goddess]

You need tractors if you're farming for tens or hundreds of thousands of people. In which case it's probably not the apocalypse yet.

As the OP says the knowledge of making enough food to keep yourself, your family and your probably decimated community fed and healthy is the number 1 requirement for surviving civilisational breakdown.