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I've created a crop viability mod for my server. Initially it will just contain a couple of things to make otherwise unsustainable crops usable, but my mid-term plan is to make fertiliser useful if impending patches don't address the issues with it. It's really affecting my ability to farm...
Right now the only content is a tomato seed recipe (turn tomatoes in to tomato seeds, like some other crops), because tomatoes are totally unsustainable crops at the moment.
Just extract that zip in to /YOURSERVER/mods/
If you have any requests for content let me know.