De or het plantenecologie?

The correct Dutch article is:

de plantenecologie

Rule Words ending in -logie: always de. See the rule
Meaning (Dutch) (biologie) ecologie van de planten

How to use plantenecologie

the plantenecologiede plantenecologie
this plantenecologiedeze plantenecologie
that plantenecologiedie plantenecologie
our plantenecologieonze plantenecologie
your plantenecologiejouw plantenecologie
every plantenecologieelke plantenecologie
which plantenecologie?welke plantenecologie?
a big plantenecologie / the big plantenecologieeen grote plantenecologie, de grote plantenecologie

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).