Sahih Bukhari Volume 002, Book 024, Hadith Number 560.

Narated By Salim bin 'Abdullah : From his father, The Prophet said, "On a land irrigated by rain water or by natural water channels or if the land is wet due to a near by water channel Ushr (i.e. one-tenth) is compulsory (as Zakat); and on the land irrigated by the well, half of an Ushr (i.e. one-twentieth) is compulsory (as Zakat on the yield of the land)."

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