Most of the time, you can't — although there are a number of alternatives to use like is called.
To activise a passive-voice sentence you need to introduce a subject to replace the [perhaps unstated] agent:
- x is called y [by z];
- z calls y x.
That leads to a sentence which might sound condescending:
In agriculture, we call the impartial care for both the production of edible biomass and sustainability Agroecology.
Otherwise, simply define the term. I've moved "in agriculture" here to what is probably the least awkward place:
Agroecology is the impartial care for both the agricultural production of edible biomass and sustainability.