Kelp seaweed is actually a really good natural fertilizer. It has a cell structure that filters sea water for rich nutrients. This minimalistic mod makes kelp act exactly like bone meal. This works both when a player right-clicks a crop and when used in a dispenser.
The effect in action:
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And with a dispenser:
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You may freely use this mod in any modpack, as long as the download remains hosted within the CurseForge or Modrinth ecosystem.
Serilum.com contains an overview and more information on all mods available. For issues, ideas, suggestions or anything else there is the Github repo. Thanks!