First cultivation | The basics Farming Simulator 2013 Guide

After harvesting the crops, it's necessary to clean up the field from remaining the remaining hay.

While the harvester is still collecting crops, you should start cultivating the field. For that, you need to tractor and cultivator which have been described above.

The cultivator clears the field and prepares it for sowing.

Once again you can do the job yourself, or hire a worker. I'd recommend the latter option. Without cultivating the field, you won't be able to seed again. What's important is that the field doesn't need to be plowed again afterwards (you don't have plows either way). The game doesn't include a crop rotation system, so you can sow anything without having to fear that the crops will be worse.

While one of the workers is harvesting and the other cultivating, you can focus on collecting the crops from the harvester and at the same time take care of field number 29.