Ruling 2261
The share of each party must be a half, a third, and suchlike, of the produce. If they agree that, for example, 10 kilograms will belong to the owner and the rest will belong to the person who does the work, the transaction is not valid.
-Ayatullah Sistani, Practical Laws of Islam, Tree Tending Contract (Musaqah) and Tree Planting Contract (Mugharasah)