I rarely add a mod to an existing game, and never ever remove one. Pick your mods and do small test map to see if chosen work together and you have what's needed. Rarely have I used other mods with the North, CC, or RK - each of those mod have everything needed and are special and complete in themselves. CC and RK full do not run well on my laptop so I do not use often.
Regarding added livestock with fertilizer, I don't know with the North. Did you already have livestock on the map? If yes, that is problem - don't use RK livestock. If no, try RK livestock at top of mod list. If still crashes don't use. Load save game from before adding livestock mod - don't build tropical greenhouse but do not remove mod.
