I meant which one of these five research categories.
Oh shit sorry
Those would all be Industrial, for the farming industry.
Bar the Fish Farming, which is Naval.
Land reclamation is ways to expand the colony's reach via terraforming, outposts, and potential synthesis with the forest/going underground/extending out into the water.
Industrial covers techs to do with exploiting the existing slots and resources. If it is a way to get or store more Money, Food or Resources then it is likely Industrial (unless it it is sea-based)
Naval covers sea-trade, river & coast exploitation and the growth of your Docks into an eventual Harbour. If it goes into the water then it will likely be Naval.
Defense covers things like siege preparation, your colony's armed forces, and the eventual transition from a militia and mercenaries into actual troops. Also intrigue advancements against saboteurs and assassins.
Morale covers preventing unrest, expanding your prestige growth, managing prestige losses, and some Intrigue advancements to prevent hostile cults/corruption slipping in.