l am not familiar with the "organic" label requirements in Spain but here in the USA, it means you can only use chemicals that are on the USDA list of approved chemicals.
What this means is; even though it is labeled organic it might not be what I consider organic (my definition is vastly different than the Government's definition).
My definition is only natural occurring additives may be used, no "cides" of any kind allowed and nutrients come from animal and vegetable decaying into
compost or emulsions that are then watered into the soil.
Our soil is now rife with mycorrhizae, good microbes and decayed manures/ plant matter. We use DE and for water wetting agents we use only those the earth mother provides. The harshest material we use is borax, a natural termite and ant deterrent.
That said, I do know that any tree I plant will never see any chemicals from then on.
Most chemicals used on trees are either to add nutrients (fertilizers) or to prevent infestation (insecticides) both of which do not have really long lasting effects once the tree is planted and the artificial additives are no longer used on it.
Here is something very interesting, Spain apparently does not have an Organic certification
Organic Bio shows Portugal and all the other countries that have a certification program / Label and Spain is not listed.