How is the Zakat calculated for date palms that are irrigated by electricity at the owner's expense, the farmer is given a quarter of their yield, and they require fertilization every three years, also at the owner's expense?

The contract between the two parties is a permissible sharecropping contract according to Sharia (definition). The zakat (definition) obligatory on the aforementioned date palms is half a tenth, based on the saying of the Prophet, peace and blessings be upon him: "On what is watered by the sky and springs or what is rain-fed, a tenth; and on what is watered by irrigation, half a tenth." As for expenses like electricity and fertilizers, the majority of scholars believe that they are not to be deducted from the harvest before paying zakat. The quarter of the harvest, which is the worker's share, is subject to zakat by its owner (the worker) if it reaches the nisab (definition) (threshold).