BSD Does one have to take ma’aser (tithe) from produce grown in a non-Jewish field (located in the Holy Land)? If yes, does a Jewish sharecropper (working in the field for percentage) have to take ma’aser from both his part and the owner’s part?
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If one planted trees in his friend’s field without asking him, or rebuilt his derelict house that way, how much does the (unwilling) recipient of that favor have to pay his benefactor?