Combined crops are those which coexist, for all or part of the growth cycle, on the same plot or cultivated land during the agricultural year.

In the case of combined crops, the area is allocated proportionally to the land use of each of the crops that make up the association.

Crop mixtures or mixed crops, whose products are not harvested separately and which are regarded as a single crop (e.g. mixed cereals), are not considered combined crops.