For fertilizer,It may become a choice for who don't like matter tech polluted their pentapod hunting ground.

You could just import from Nauvis. Assuming your science is there you're delivering Agri Cards from Gleba to Nauvis so you can bring them back on the same ship.

The greenhouse recipes for Gleba crops also seem to put out much less pollution than growing equivalent trees. Is this intentional? It makes the agricultural tower kind of worthless, perhaps it could be a sidegrade instead where greenhouses net you more crops for the space taken up, support quality modules, etc but the use of foreign fertilizer causes a significant increase in spore pollution.

Greenhouses were intended to emit the same amount of spores as regular farming.
For some reason I calculated greenhouse spore output per second ,instead of minutes,so greenhouses outputted 1/60 of intended pollution.