Salim bin Abdullah narrates from his father (Sayyiduna Abdullah bin Umar, may Allah be pleased with them both): For (land or produce) that is irrigated by rainwater, or by a canal or a spring, or which is ‘ushri land, the Prophet Muhammad (peace be upon him) made the payment of one-tenth obligatory. And for that which is irrigated by bringing water on camels, he made the payment of half of one-tenth obligatory.