Breeding work aimed at improving the breeding quality of crops and greenwoods in which gaps and thinnings have been created for variousreasons, having an impact on the future decrease in the quality of both tree stands and timber.

Corrections cover any activities connected with additional planting of seedlings in the crops of artificial origin, aged up to 5, established on open areas.
Supplements consist of additional planting of seedlings in older crops (aged morethan 15), and young stands of artificial origin, aged up to 20.

• Tending