It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) that he heard the Noble Prophet (peace and blessings of Allah be upon him) say: In the (field) which is irrigated by canals and rain, ‘ushr (i.e., one-tenth) is obligatory as zakat, and in that which is irrigated by camels (i.e., by manual labor), nisf al-ushr (i.e., one-twentieth) is obligatory as zakat.