What duties fall upon the owner of the capital (Rabb al-Mal) in an unrestricted sharecropping contract?

Primary text

The owner of the capital is responsible for tasks related to preserving the principal asset (the trees/land). This includes building retaining walls (sudd al-hitan), constructing new canals (insha' al-anhar), building the water wheel, digging its well, and purchasing materials needed for pollination.