The rope is made of hemp, it could be used as fertilizer, as hemp is mostly biodegradable. All it means is that you would most likely need to tear apart the rope
Steam Workshop::Make fertilizer (OLD version probably won't work)
Unturned 3.6.5.0 Update: Planters and Fertilizer (+Fixes) - YouTube
Unturned | Tutorial | How To Make FERTILIZER!!" - YouTube
Composting manure on-farm using an aerated, static (unturned) pile.... | Download Scientific Diagram
Steam Community :: Guide :: -Bamboo's Guide to House Building- [UPDATED 2.0.8!]