How should the Zakah be calculated on more than 60 palm trees?

Q: My father has more than 60 palm trees. How should the Zakah (obligatory charity) be calculated on them? My father allocates one palm tree for so-and-so and another palm tree for another person and so on, specifying them to some relatives, in-laws, neighbors and others. Is this way of allocating certain palm trees for certain persons acceptable as Zakah, or should it be done another way? Please advise us in detail, for so many other similar examples are found in the villages. A: The gift mentioned above is not acceptable as Zakah, since it is obligatory to give the due Zakah on all dates after reaching the Nisab (the minimum amount on which Zakah is due). (Part No. 8; Page No. 54

A: The gift mentioned above is not acceptable as Zakah, since it is obligatory to give the due Zakah on all dates after reaching the Nisab (the minimum amount on which Zakah is due). (Part No. 8; Page No. 54) The due Zakah is 5% of the entire harvest of the land irrigated by machinery and the like and 10% on the land irrigated by rains, rivers, springs, etc.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.